Program Overview: June 3-6, 2025

**Times are approximate**

Tuesday,
June 3
Wednesday,
June 4
Thursday,
June 5
Friday,
June 6
Registrant Breakfast 6:00 AM - 7:00 AM 6:00 AM - 7:00 AM 6:00 AM - 7:00 AM
Scientific Sessions
Pitter Event Center
7:00 AM - 12:00 PM 7:00 AM - 12:00 PM 7:00 AM - 12:00 PM
Business Meetings
Members Only
12:10 PM - 1:00 PM
Working Lunch
12:10 PM - 1:00 PM
Working Lunch
Group Activities* 2:00 PM 2:00 PM
Evening Events Welcome Reception
PitterKeller
7:00 – 10:00 PM
Annual Banquet
Pitter Event Center
7:00 – 10:00 PM

*Additional Registration Required

Interactive Agenda

07:00 - 07:45
Registration and Breakfast (Kristall Foyer)
Kristall Foyer
07:45 - 07:50

Welcome and Introductions

Pitter 1-2

07:45 - 07:47 Lecture
Welcome from the President
 
  President: Eric C McCarty, MD  |  UNITED STATES
 
 
       
07:47 - 07:50 Lecture
Welcome from the Vice President and Program Chair
 
  Chair: Walt R Lowe, MD  |  UNITED STATES
 
 
       
07:50 - 08:40

Session 1: Knee - ACL

Pitter 1-2

07:50 - 07:56 Lecture
ACL Injury Treatment Decision: Is Conservative Care an Option?
 
  Ramon Cugat Bertomeu, MD  |  SPAIN
 
   
Description
The treatment guidelines for ACL injuries include ensuring optimal preoperative conditions marked by the absence of pain, good range of motion, and no effusion. The approach to treatment varies based on the severity of instability, type of injury and patient conditions. Deciding on the best treatment for an ACL injury requires careful consideration of several factors, including the severity of the injury, the patient’s age, activity level, and overall health. While surgical intervention is often seen as the gold standard for addressing ACL injuries, conservative care remains a viable and important option, especially in cases of mild to moderate instability or when patients wish to delay surgery. When considering the best treatment option for a professional athlete, it is essential to primarily ensure the diagnosis with an arthroscopy. Conservative management typically involves a well-structured rehabilitation program focused on strengthening the muscles around the knee, restoring function and intra-articular treatments, such as PRP that can help to promote healing and reduce pain, allowing for improved joint stability and function. In young patients, especially those with open physes, conservative care may be the preferred route to avoid growth-related complications. Ultimately, the decision must be personalized, weighing both short-term and long-term outcomes, as well as the patient’s quality of life and overall health objectives. Lately, a new conservative protocol for complete ACL tears has been proposed showing good results. Such treatment hypothesizes that bending the knee at 90º for four weeks followed by a progressive ROM extension program and a specific strengthening protocol may enhance ACL healing by bridging the gap between the sectioned ligament parts. This new option may offer a treatment alternative to those patients with mild to moderate ACL injuries, showing potentially better outcomes compared to rehabilitation alone. When surgery is necessary, treatment options may include revision arthroscopy with intra-ligamentous PRP injection, ACL reattachment, ACL reconstruction (ACLr), and repair of any damaged intra-articular structures. In ACLr, the gold standard graft choice is BPTB. Proper graft placement, isometry testing to ensure appropriate graft tension, and extra-articular reinforcement may be required to address challenging pivot shifts that aren't resolved through intra-articular reconstruction. A comprehensive post-surgical rehabilitation program, including a criteria-based return to sport and full prevention protocols, is crucial to the success of the overall treatment strategy.
 
       
07:56 - 08:02 Lecture
Development of an Anterior Cruciate Ligament Injury Prevention Program in the National Football League: A Comprehensive Framework
 
  Robert H Brophy, MD  |  UNITED STATES
 
   
Description
ACL injury prevention programs (IPPs) have demonstrated previous success in mitigating injury risk in a variety of sports. However, there have been no published reports or studies documenting formalized ACL injury mitigation efforts in American football. Recent evidence from the National Football League (NFL) have demonstrated that the majority of ACL injuries in the NFL were non-contact in nature, similar in fact to the distribution in other sports. This study describes initial steps to develop an ACL IPP in the NFL. I. Initial steps a. Describe development team b. Assessing the need for and potential barriers to such a program c. Potential framework of the program in terms of timing, frequency, duration, etc. II. Multidisciplinary team assembled III. Exercise development/description IV. Development of draft program V. IRP and NFL MRAP to approve developing, implementing and studying the injury prevention program VI. Development of data collection tool VII. Pilot implementation a. Initial season 4 teams i. Reviewed compliance ii. Refined program b. Second season 7 NFL teams and CFL VIII. Early compliance/challenges IX. Next steps
 
       
08:02 - 08:10 Discussion
 
 
       
08:10 - 08:16 Lecture
What do we have to fear but fear itself . How patients fear of movement affects outcomes following ACL reconstruction
 
  Darren L Johnson, MD  |  UNITED STATES
 
   
Description
Fear of movement at the time of ACL surgery was not related to early recovery. However, clinically high levels of fear of movement at 3 months did result in poorer recovery fo strength and patient reported outcomes. Potentially intervening with a counseling program may be effective for patients whose fear of movement is high at 3 months.
 
       
08:16 - 08:22 Lecture
Therapeutic Potential of Non-Invasive Brain Stimulation for Long-Term Deficits Following ACL Reconstruction
 
  Christopher C Kaeding, MD  |  UNITED STATES
 
   
Description
Investigation into the interplay between musculoskeletal system and the central nervous system in setting of Anterior Cruciate Ligament reconstruction.
 
       
08:22 - 08:28 Lecture
Arthrogenic Muscle Inhibition Part 2 : A Brain fMRI Study following ACL rupture
 
  Bertrand Sonnery-Cottet, MD, PhD  |  FRANCE
 
   
Description
Background: Muscle inhibition following anterior cruciate ligament (ACL) injury, known as Arthrogenic Muscle Inhibition (AMI), is a neurally based condition characterized by abnormal cerebral activity. While the mechanisms underlying these neuromotor changes remain poorly understood, AMI is believed to involve altered brain activity. Purpose: This study aimed to identify modifications in sensory-motor network connectivity related to AMI occurrence after ACL rupture using functional MRI (fMRI). The hypothesis was that AMI is associated with overactivation of brain regions responsible for pain and inhibitory motor control. Study Design: A prospective cohort study (Level IV evidence) was conducted. Methods: From October 2019 to June 2024, patients with acute ACL rupture were enrolled and divided into two groups based on the presence of AMI (AMI group vs. No-AMI group). All patients underwent fMRI, including a resting-state scan and an active motor imagery task (right leg movement). First, brain regions with higher activity in the AMI group during the active task were identified. These regions were then used as seeds for resting-state analysis to explore AMI-related brain networks. Results: A total of 40 male patients (mean age 24.1 ± 2.9 years) were included, with 20 patients in each group. The average time between ACL rupture and fMRI was 22.7 ± 7 days. Active fMRI revealed significant overactivation of the right cerebellum in the AMI group compared to the No-AMI group. Using the right cerebellum as a seed, an associated brain network was identified, including bilateral prefrontal cortices, temporal cortices, the left post-central gyrus (primary somatosensory cortex), and bilateral cingulate cortices. Conclusions: This study confirmed that patients with AMI after ACL rupture exhibit functional brain alterations, particularly in a network centered around the right cerebellum. This network involves regions responsible for sensory-motor inhibition, pain processing, and emotional regulation, suggesting that pain or emotional responses following ACL injury may enhance motor inhibitory processes via the ipsilateral cerebellum.
 
       
08:28 - 08:40 Discussion
 
 
       
08:40 - 09:30

Session 2: Knee - ACL

Pitter 1-2

08:40 - 08:46 Lecture
Posterior tibial slope increases over time in the ACL Deficient Knee
 
  Volker Musahl, MD  |  UNITED STATES
 
   
Description
Introduction: An increased posterior tibial slope (PTS) is a recognized risk factor for anterior cruciate ligament reconstruction (ACL-R) failure. This study aimed to determine PTS changes over time in a skeletally mature revision ACL-R cohort. Methods: A ten-year chart review of patients who underwent revision ACL-R was performed. Inclusion criteria included having index knee radiographs spanning at least five years, with the first radiograph taken at the time of the primary ACL-R and any subsequent radiograph taken at least five years later, and age >14 years. Standard error of measurement method was used to calculate minimum detectable change (MDC) using radiographic PTS measurements. As determined by three raters, mean MDC was 1.0° (95% confidence interval (CI)). Patients were categorized into two groups based on PTS change: >2° (Group 1) and =2° (Group 2), ensuring changes >2° were considered free of measurement error. Data was collected for demographics, clinical and operative histories including meniscal injuries, presence of cartilage procedures, and International Knee Documentation Committee (IKDC) and Marx activity scores, as well as return-to-sports status. The reliability of PTS measurements was assessed by two blinded raters measuring 25 randomly selected radiographs at three separate time points. Results: A total of 76 patients with a mean age of 25.3±10.3 years were included in this study. The mean radiographic follow-up duration was 8.9±3.6 years. There was a significant increase in PTS between the most recent and oldest available radiographs for the entire cohort, 12.6±3.3° vs. 11.5±3.2° (p<.001), respectively, with a mean increase of 1.1±1.5°. This change was greater than the mean MDC. Radiographic follow-up length did not correlate with the magnitude of PTS change. Group 1 (n=19) did not differ in baseline demographics and other investigated parameters compared to Group 2 (n=57), including demographics, radiographic follow-up length, number of previous ACL-R, and ACL deficiency duration. Additionally, Groups 1 and 2 showed no significant differences in latest IKDC scores, Marx scores, nor return to sports status. Having a PTS increase of >2° was associated with prior posterior medial meniscal resection (p=.003) compared to =2° PTS increase. No other surgical history showed significant associations with greater PTS change. A greater PTS change over time was associated with PTS =12° (p<.001) on the latest radiograph. There was an excellent interobserver (Cronbach a=0.916) and intraobserver reliability (Cronbach a ranging between 0.916 and 0.969). Conclusion: In this radiographic follow up study, PTS consistently increased in a revision ACL-R cohort over a mean follow-up of 9 years. Posterior medial meniscus resection was statistically significantly associated with a greater (>2°) increase in PTS over time. The findings suggest that increasing PTS over time may be the fate of the failed ACL. Additionally, PTS =12° may be considered a deformity that may continue to progress over time unless corrected.
 
       
08:46 - 08:52 Lecture
The Effect of Medial and Lateral Tibial Slope Asymmetry on Anterior Tibial Translation, Internal Knee Rotation, and ACL Graft Force in the Setting of an ACL Reconstruction.
 
  Armando F Vidal, MD  |  UNITED STATES
 
   
Description
INTRODUCTION: It is well established that the posterior tibial slope has been identified as a risk factor for ACL ruptures. Slope correcting osteotomies have become an important aspect of the orthopedic surgeon’s armamentarium when faced with revision ACL reconstruction (ACLR) in the setting of increased tibial slope. However, these current procedures produce the same amount of slope correction for the medial and lateral tibial slope and do not account for difference in tibial slope between the compartments. These differences have been shown to affect both risk factors for ACL tears with concomitant meniscal pathology, poorer clinical outcomes of ACLRs with medial or lateral meniscal repairs, and risk of the pivot shift phenomena (anterior tibial translation and internal knee rotation) after ACLR. It is unclear, however, how changes to the tibial slope and the asymmetry between medial and lateral tibial slopes affects ACL graft force, anterior tibial translation, or knee rotation. The aim of this study is to determine how the difference in medial and lateral tibial slope affect anterior tibial translation, knee rotation, and ACL graft force in the setting of an ACL reconstruction. We hypothesize that greater asymmetry between the medial and lateral slopes will result in greater tibial translation, knee rotation, and ACL graft forces. METHODS: Twelve fresh frozen human cadaveric knees were acquired, dissected, and imaged via a computed tomography (CT) scanning. Native medial and lateral tibial slopes were measured from the CT scans by an orthopaedic surgeon. Anterior-wedge, slope-reducing osteotomies were performed on the medial and lateral compartments independently utilizing cuts similar to those used for unicompartmental knee arthroplasty such that the slope could be reduced to zero then increased incrementally back to the native slope. A custom external fixture was installed to stabilize the osteotomy, and a soft-tissue ACLR was performed with the proximal end of the graft secured via an interference screw. Custom 3D printed wedges were created to stabilize the osteotomies such that eight testing states could be tested (Table 1). Each specimen was first tested with both the medial and lateral compartments in their native slopes, then each testing state was tested in random order (Table 1). Each specimen was mounted in full extension to an axial-torsion testing machine via a custom jig that permitted anterior-posterior tibial translation, and the distal end of the ACLR graft was secured to a force transducer. A 500 N compressive load and 0-N torque was applied to the specimen. Tibial translation was measured using a linear displacement sensor and knee rotation was measured with the testing machine for all testing states. ACL graft forces were measured via the force transducer clamped to the graft. Differences in these outcomes between the native state and the testing states were calculated. RESULTS: As lateral slope increased by 1°, ACL graft force increased by 4.94 N. As medial slope increased by 1°, ACL graft force increased by 1.92 N. There was no interaction effect in ACL graft force between medial and lateral slopes. As lateral slope increased by 1°, anterior tibial translation increased by 0.63 mm. As medial slope increased by 1°, anterior tibial translation increased by 0.48 mm. There was no interaction effect in anterior tibial translation between medial and lateral slopes. DISCUSSION: This study revealed that a greater tibial slope of the lateral compartment compared to the medial compartment may affect knee rotation, anterior tibial translation, and ACL graft force, and that these effects may be exacerbated as the medial-lateral tibial slope asymmetry increases. This biomechanical evidence supports clinical outcomes which report that increased medial-lateral tibial slope asymmetry increases the likelihood of ACL graft failure. This study supports the need to develop a new technique that would allow for independent medial and lateral slope reducing osteotomies. SIGNIFICANCE/CLINICAL RELEVANCE: These results indicate that independently reducing the tibial slope of the medial compartment may reduce the likelihood of ACL graft force failure.
 
       
08:52 - 08:58 Lecture
LET Increasing Protects ACL Grafts at Higher Slope
 
  Walt R Lowe, MD  |  UNITED STATES
 
 
       
08:58 - 09:10 Discussion
 
 
       
09:10 - 09:16 Lecture
Predictability of Early Isokinetic Testing on Return to Sport following ACL Reconstruction
 
  Geoffrey S Baer, MD, PhD  |  UNITED STATES
 
   
Description
Introduction: Anterior cruciate ligament (ACL) tear is a common injury that occurs while playing dynamic sports, and after reconstruction (ACLR), it takes many months for recovery. Isokinetic strength tested with Biodex is an objective measure used to track rehabilitation. It can measure quadricep and hamstring strength through knee extension and flexion respectively. While this is a measure of whether an athlete is ready to return to sport (RTS), further exploration of the correlation between early testing results and subsequent return to sport is needed. The purpose of this study was to distinguish the early post-operative differences in isokinetic strength post ACLR between those who RTS earlier vs later. These differences could then identify potential variables used to further explore RTS predictability. Our hypothesis was that higher isokinetic strength early would correlate with an earlier RTS. Methods: All patients that presented to a single academic sports medicine institution with isokinetic strength testing (Biodex) results between 3-9+ months postoperatively and return to sport clearance at 9+ months from March 2019-June 2023 were retrospectively reviewed. Descriptive statistics were compiled and stratified by time point and RTS clearance. Repeated measures modeling was used to model multiple comparisons for those who did and did not RTS. Comparison of isokinetic testing values between those who did not receive vs those who did receive RTS clearance at 9 or 12 months was done through Type 3 test of fixed events modeling. A life test procedure was run to get the probability of return to sports across time with the predictor variables of interest as a strata. Finally, comparisons between torniquet use, femoral nerve block use and graft types were performed by modeling each isokinetic testing scores with the surgical factors as predictors while holding all other predictors constant. Results: A total of 487 patients were included. Of those, 363 individuals had documented clearance of RTS from the surgeon which provided the exact timing post ACLR for RTS. Those that returned to sport at 9 months had a higher average in peak torque knee extension to body weight and their limb symmetry index at 3-4 months [0.59N-m (p<0.01)] [60% (p<0.01)], 5-6 months [0.67N-m (p<0.0001)] [80% (p<0.0001)], and 7-8 months [0.72N-m (p<.001)] [84% (p<0.01)] compared to those who did not RTS at 9 months. Using peak torque knee extension as a predictor variable, performing at 0.45N-m (p<0.001) or having a limb symmetry index of 57% (p<0.001) at 3-4 months demonstrated a 50% probability of returning to sport by 12 months post ACLR. Performing beyond that correlated with higher probability. Based on modeling, graft type was significant for differences in isokinetic strength testing with the quadricep tendon graft demonstrating worse performance with both knee extension and flexion [-0.09N-m (p<0.001)] [-0.08N-m (p<0.0001)] and the hamstring tendon graft having better performance in extension and worse performance in flexion [0.04N-m (p<0.001)] [-0.09N-m (p<0.0001)] compared to the bone patellar tendon bone graft. Torniquet use during ACLR demonstrated a decreased performance [-0.03N-m (p<0.05)] in knee flexion while femoral nerve blocked showed better performance [0.05N-m (p<0.005)]. Having concurrent surgical correction for torn meniscus did not signify any difference in isokinetic testing. Conclusions: Performing better in isokinetic knee extension strength at earlier timepoints post ACLR correlates with earlier RTS and was significant for demonstrating the probability of when one could RTS within 12 months. With further research, a predictive model for RTS after ACLR could be developed using this variable. Surgical factors like graft type, torniquet use, femoral nerve block and additional surgical corrections during the procedure correlated with differences in isokinetic testing as well.
 
       
09:16 - 09:22 Lecture
Force plate vs. Isokinetic Testing for Return to Play after ACL Reconstruction
 
  Michael B Banffy, MD  |  UNITED STATES
 
   
Description
Metrics for return to play after ACL reconstruction continue to evolve. We seek to assess correlations between dynamic force plate testing against isokinetic strength testing as a metric that can be used to determine when a patient is ready to return to play following anterior cruciate ligament (ACL) reconstruction surgery. Methods: Forty-five subjects over 18 who underwent ACL surgery with the same surgeon were tested during their post-operative clinic visits at the 4-month and 6-month post-operative periods. Force plate testing included a squat jump (SJ), countermovement jump (CMJ), and Single-leg jump (SLJ) to determine their Reactive Strength Index (RSI), Rate of Force Development (RDF), max take-off peak power, peak landing force. Their isokinetic strength was tested on the Biodex during the same visit, and it included total work (TW) and peak force (PF) during flexion and extension. Results: Post-operative month 4 (n=45), correlations between the CMJ and Biodex exhibited 4 positive moderate correlations and 1 positive strong correlation (Table 1a). Correlations between SJ and Biodex exhibited 14 positive correlations of moderate strength and 1 positive correlation of strong strength (Table 1b). At post-operative month 6 (n=38), Countermovement Jump and Biodex exhibited 5 positive correlations of moderate strength (Table 2a). The Squat jump and Biodex exhibited 9 positive correlations of moderate strength (Table 2b). Conclusion: Force plate and isokinetic testing both provide useful objective strength asymmetry measurements. While both modes of assessment provide clinicians with meaningful and relevant feedback during the RTP process, the isokinetic testing alone overlooks the eccentric and functional component of athletic movements.
 
       
09:22 - 09:30 Discussion
 
 
       
09:30 - 10:00
Break
10:00 - 10:21

Session 3: Herodicus Godparent Honored Lecture

Pitter 1-2

10:00 - 10:03 Introduction
 
  President: Eric C McCarty, MD  |  UNITED STATES
 
 
       
10:03 - 10:15 Lecture
Dilemma of Alpine Skiers Knee Injury
 
  Richard H Rokos  |  UNITED STATES
 
 
       
10:15 - 10:21 Discussion
 
 
       
10:21 - 10:51

Session 4: Shoulder - Instability

Pitter 1-2

10:21 - 10:27 Lecture
Novel Gene Identified in Association with Recurrent Shoulder Instability
 
  Lance LeClere, MD  |  UNITED STATES
 
   
Description
Background: Established risk factors for recurrent dislocation include age under 30, male sex, and family history; however, genetic predisposition to GHI has not been thoroughly investigated. This study aims to explore potential genetic risk factors for GHI and assess its heritability using genome-wide association studies (GWAS). Methods: We conducted a large-scale GWAS using BioVU, Vanderbilt University Medical Center's de-identified biobank, which includes genetic data from over 300,000 individuals linked to de-identified medical records. Cases and controls were identified using a combination of ICD and CPT codes, with manual validation ensuring accurate classification of 390 cases and 53,068 controls. GWAS analyses were conducted, adjusting for sex, age, and 10 principal components, using a minor allele frequency (MAF) threshold of 0.05. Sensitivity analyses were performed to examine genetic predisposition among individuals with recurrent instability, by sex, and in those with ligamentous laxity-related conditions. Results: No statistically significant genetic loci were identified for overall GHI (including single dislocation/subluxation events) at an MAF threshold of 0.05. However, one genetic locus, rs4774980, reached genome-wide significance (P < 5 × 10?8) for recurrent GHI. This locus is an intron variant within the GCOM gene, though its clinical relevance remains unclear. Sensitivity analyses for sex and ligamentous laxity did not reveal significant associations, likely due to limited sample sizes. Additionally, no evidence of genetic heritability for GHI was found in any of the analyzed populations, though this may also be constrained by sample size. Conclusions: While no genetic associations were found for overall GHI, there was evidence for genetic association of SNP rs4774980 and recurrent instability. There was no evidence for heritability in any of the subgroups included in this study, however, this is likely a product of a relatively small sample size. This work suggests that future research with larger cohorts will likely help identify additional genetic variants and clarify heritability.
 
       
10:27 - 10:33 Lecture
An assessment of patients with anterior versus posterior instability: What are the differences in imaging and surgical findings? – A matched cohort analysis
 
  Matthew T Provencher, MD, MBA  |  UNITED STATES
 
   
Description
Purpose: Anterior and posterior instability of the shoulder are distinct entities and have varied pathology that needs to be properly recognized for optimal treatment. The purposes of this study are to delineate the differences in labral tear and bony injury in patients with anterior and posterior instability of the shoulder joint, and compare with preoperative MR Arthrogram findings. Methods: A total of 60 patients with anterior instability and 60 patients with posterior instability were prospectively enrolled to identify characteristics of injury to the shoulder joint and were assessed for type of labral injury pattern. Labral tears were classified as: Tear (TEAR), Periosteal Sleeve Avulsion (ALPSA/POLSPA), Labral Flap (FLAP), or Marginal Crack (CRACK), or a combination. Bone loss was measured for both anterior and posterior instability patients. All patients underwent independent video review and operative documentation to determine differences in tear types and compare to findings of MR arthrogram. Results: Patients with anterior instability (mean age 23.8, range 18-35) had more TEARs (48%), more ALPSAs (40%), versus posterior instability (mean age 24.6, range 18-39) had more CRACKs (37%), FLAPS (35%), combination CRACK and FLAP (14%), and TEAR (15%), and POLPSA (2%). The mean size of the labral tear in anterior instability was centered from 3:00 to 7:15 o’clock, versus posterior 6:00 to 9:30. The predominant labral tear was different for anterior versus posterior (p<0.02) instability. The MR Arthrogram was able to identify anterior pathology preoperatively with a PPV of 92% for TEAR, 82% for ALPSA; and 11% for FLAP, and posterior instability with PPV of 96% for TEAR, and 68% for CRACK. Bone loss in anterior instability is more severe erosion than posterior bone loss, with greater attrition and loss that occurs at a perpendicular angle (87 degrees) to the glenoid versus posterior which is more sloped (36 degrees). Conclusions: The labral pathology in anterior and posterior instability are different, with anterior instability predominantly a tear or ALPSA lesion, versus posterior instability with was largely a crack of the labrum or flap. MR Arthrogram provided very good preoperative information especially for labral tears, however, was less predictive for labral cracks and flaps. Bone loss is also different for posterior vs anterior instability. Additional work needs to identify the reason for differences in labral tear types and optimal treatment. Level of Evidence: III- matched cohort study
 
       
10:33 - 10:39 Lecture
Psychopathology and Volitional Instability: Who Should We be Operating On?
 
  Warren R. Dunn, MD  |  UNITED STATES
 
   
Description
This is discussing the ability to determine the prevalence of Psychopathological traits associated with volitional instability on 2-year outcomes following stabilization surgery
 
       
10:39 - 10:51 Discussion
 
 
       
10:51 - 11:37

Session 5: Shoulder - Instability

Pitter 1-2

10:51 - 10:57 Lecture
Use of distal tibia autograft in arthroscopic glenoid reconstruction for subcritical glenoid bone loss
 
  Jonathan Bravman, MD  |  UNITED STATES
 
   
Description
Description of current "problem" with poor outcomes in "subcritical" bone loss in shoulder instability; This talk will present the rationale, technique and early outcomes of use of distal tibia autograft in arthroscopic glenoid reconstruction for subcritical glenoid bone loss
 
       
10:57 - 11:03 Lecture
Distal Tibia Allograft for Recurrent Shoulder Instability: A Comparison of Open Fresh versus Arthroscopic Frozen Grafts
 
  Matthew T Provencher, MD, MBA  |  UNITED STATES
 
   
Description
ABSTRACT Background: The distal tibia allograft (DTA) procedure has been described as an effective treatment option for reconstruction of glenoid bone deficiency in the setting of recurrent anterior shoulder instability, with encouraging early outcomes; however, no comparative data between an arthroscopic or open DTA approach are available. Methods: A retrospective review was performed of consecutive patients with a minimum of 5% anterior glenoid bone loss (GBL) associated with recurrent anterior shoulder instability who underwent stabilization with either open or arthroscopic DTA glenoid reconstruction and had a minimum of two-year follow up. Consecutive patients undergoing frozen DTA were matched in a 1-to-1 format to patients undergoing fresh DTA by age, body mass index and number of previous shoulder operations. Patients were evaluated postoperatively with the Western Ontario shoulder instability index (WOSI) score, pain relief, and for episodes of recurrent instability. All patients also underwent postoperative imaging evaluation with computed tomography (CT) in which graft incorporation and allograft angle were measured. Statistical analyses were performed using Mann-Whitney U tests and Chi-square tests, respectively, to compare continuous outcomes and categorical variables. Results: A total of 100 patients (50 fresh open DTA, 50 frozen arthroscopic DTA) with a median ± IQR age of 32.0 ± 6.7 and 27.9 ± 15.9 years respectively, were analyzed at minimum 2 years follow-up. There were significantly more males (98% vs 70%, p<0.01) in the fresh DTA group and also had significantly greater glenoid bone loss defects (25% ± 6% vs 21% ± 11, p<0.01). Patients in both groups experienced significant WOSI score improvement (p < 0.05). Both groups demonstrated similar clinical outcomes regarding improvement postoperatively (p=0.61), pain relief (p=0.09), and recurrence rates (p=0.31). There was only one case of recurrent instability among the groups in the open fresh DTA cohort. Analysis of CT data at an average of 15 months postoperatively showed no significant difference between fresh versus frozen DTA groups for average Graft-glenoid interface healing rate, allograft angle, and final anterior-posterior dimensions (graft + glenoid). Conclusion: Open fresh and arthroscopic frozen DTA for anatomic glenoid reconstruction in patients with recurrent anterior shoulder instability results in a clinically stable joint with comparable outcomes and solid allograft healing rates. Additional long-term studies are needed to determine if these results are maintained over time.
 
       
11:03 - 11:11 Discussion
 
   
Description
 
       
11:11 - 11:17 Lecture
Rethinking the assessment and management of little league shoulder: a comprehensive approach to care
 
  John E Conway, MD  |  UNITED STATES
 
   
Description
Baseball athletes across all levels of play are at an increased risk for upper extremity injury due to the supraphysiologic demands on the shoulder and elbow during overhead throwing. Little league baseball players present with a unique subset of injuries that can affect the growth plate, commonly at the shoulder or the elbow. Ascertaining a diagnosis and plan of care for little league shoulder (LLS) historically focuses on the proximal humeral physis in skeletally immature throwing athletes presenting with shoulder pain. Researchers investigating this diagnosis have conveyed that baseball players presenting with this pathology often experience shoulder pain and proximal humeral physis stress reaction, and for some players, this is true. However, information on LLS has evolved over time and should include a multidisciplinary continuum of care that should evaluate many variables that are often not discussed which include scapular dysfunction, glenohumeral motion loss, muscle weakness, kinetic chain dysfunction, and most importantly posterior glenoid dysplasia, a component to this diagnosis that many healthcare providers might not even know exists. This lecture will provide strategies for measuring posterior glenoid dysplasia on radiographic imaging, and show the ossification process that occurs with appropriate management in patients diagnosed with LLS. Additionally, a case study will be presented to describe common radiographic and clinical presentations, objective examinations, and a plan of care from time of evaluation to return to throwing.
 
       
11:17 - 11:23 Lecture
Hand Size Association with Baseball Pitch Velocity and Spin Rate Characteristics
 
  Michael T Freehill, MD  |  UNITED STATES
 
   
Description
Anthropometric variables such as hand size and hand length have shown a positive correlation with grip strength and may be an important factor in sports where grip strength is important. Smaller hand size has also been correlated with a history of ulnar collateral ligament reconstruction in professional baseball pitchers, however, the influence of hand anthropometric variables on actual pitching metrics and characteristics remains undefined. The purpose of this study was to investigate if there is a correlation between hand size, pitch velocity, and spin rate. This is unpublished material which data is still being run. This is a controversial topic which will ignite some debate. In this day and age of blossoming pitch design and continued pitcher injuries on the rise- it has a valuable place in the discussion.
 
       
11:23 - 11:31 Discussion
 
 
       
11:31 - 11:37 Lecture
The Impact of Deep Learning Model Assistance on the Diagnosis of Labral Tears
 
  Sherwin SW Ho, MD  |  UNITED STATES
 
   
Description
Recent advancements in deep learning (DL) have opened new possibilities for diagnosing musculoskeletal pathologies. Our study assesses the utility of DL models for more accurately diagnosing glenoid labral tears. Specifically, we examined whether model-assisted interpretation of MRI's and MRA's could improve accuracy compared to unaided interpretation.
 
       
11:37 - 11:43 Lecture
The Distinct Pathomorphology of Reverse Hill-Sachs Lesions: An Advanced 3-Dimensional Imaging Analysis
 
  Matthew T Provencher, MD, MBA  |  UNITED STATES
 
   
Description
Purpose: To 1) characterize the morphology of rHSLs in the setting of recurrent posterior shoulder instability using advanced three-dimensional (3D) imaging analysis, and 2) compare these metrics to HSLs in patients with anterior instability. Methods: A retrospective review was performed of patients between 2004-2010 who presented with recurrent posterior shoulder instability. Patients with rHSLs were pair-matched in a 1:4 ratio for age, sex, and laterality to those with HSLs. 3D models of unilateral proximal humeri were reconstructed from two-dimensional (2D) CT scans, and width, depth, surface area (SA), and volume of identified rHSLs and HSLs were quantified, along with their location (medial, superior, and inferior extent) and orientation (rHSL/HSL rim (r) and center (c) angle). Results: A total of 25 rHSLs, including 21 males and 4 females, with mean age: 27.9 years, (range: 18 - 39 years), were pair-matched to 100 patients with HSLs. Mean rHSL depth, width, SA, and volume were 0.9 mm (range = 0.20-2.1 mm), 9.1 mm (range = 4.0-17.9 mm), 129.1 mm2 (range = 37.9-357.8 mm2), and 366.2 mm3 (range = 54.2-1488.7 mm3), respectively. When compared to HSLs, rHSLs were significantly narrower (p < 0.001), shallower (p < 0.001), had a smaller SA (p <0.01), and had a greater angulation relative to the humeral diaphysis (p < 0.001), thus the rHSL involved more of the humeral head cartilage. Conclusion: rHSLs are significantly narrower, shallower, involve more of the humerus cartilage, and occupy less surface area than HSLs. Appropriate morphological distinction between rHSLs and HSLs is imperative to correctly tailor treatment in the setting of posterior shoulder instability.
 
       
11:43 - 11:51 Discussion
 
 
       
11:37 - 12:00
Break to Excuse Non-Members
12:00 - 13:00

Business Meeting I (Members Only - Working Lunch)

Pitter 1-2

       
07:00 - 07:45
Breakfast (Kristall Foyer)
Kristall Foyer
07:45 - 07:50

Welcome and Announcements

Pitter 1-2

    President: Eric C McCarty, MD  |  UNITED STATES
Chair: Walt R Lowe, MD  |  UNITED STATES
   
07:50 - 08:50

Session 1: Sports Medicine & Whole Athlete

Pitter 1-2

07:50 - 07:56 Lecture
Variation in State Policies on Sideline Medical Coverage of High School Athletic Events
 
  Matthew J Matava, MD  |  UNITED STATES
 
   
Description
Background: Athletic trainers are the primary source of sideline coverage for high school athletic events, providing an essential role in injury recovery and prevention while serving as liaisons to parents and the greater medical community. However, there is a paucity of literature evaluating the existence of state requirements regarding the presence of athletic trainers and mandatory sideline medical coverage of high school athletic events. Purpose: The purpose of this study was twofold: 1) To determine the requirements for the athletic trainers or other healthcare professionals for the provision of sideline medical coverage of high school athletic events in all 50 states and the District of Columbia, and 2) To analyze regional variation in sideline medical coverage for high school sports across the United States. Study Design: Cross-sectional Survey Methods: A 17-question survey was emailed to the executive directors (or analogous position) of the state high school athletic associations for all 50 states and the District of Columbia. The survey was conducted to assess current state regulations regarding the employment of ATCs and the provision of sideline medical coverage for high school athletic events in the United States from 2023-2024. The same survey was sent to the NATA president for those states that did not respond. The primary variables that were of interest included: the presence or absence of sideline medical coverage mandates, any requirements for the presence of athletic trainers for high school athletic events, and whether the state association distinguished between collision and non-collision sports in mandating sideline medical coverage. Secondary variables included distinctions between public and private high schools, school classification, athletic trainer employment level, and the type of healthcare professionals that satisfy the sideline medical coverage mandates, if present. All response options were presented as either a binary choice (yes/no), free-form text, or a “select all that apply” list. All responses were treated as independent observations for analysis. The data were analyzed using descriptive statistical methods, as well as Welch’s t-test with un-pooled variance to explore associations. Results: The overall response rate was 94% (48/51). Of the 48 state associations that responded, 11 (23%) had sideline coverage mandates, including sideline coverage for all events and risk-dependent sideline coverage. A total of 3 states (6%) had complete sideline coverage mandates, while 8 states (17%) had risk-dependent sideline coverage mandates. Of the 48 responding states, 37 (77%) had no sideline coverage mandate. No states required the presence of an athletic trainer at high school athletic events. On average, those states with more high schools were more likely to not have mandatory sideline medical coverage. Similarly, more high schools throughout the country were in states without a sideline medical coverage mandate, which means that approximately 92% of high schools in the United States are in states without a requirement for sideline medical coverage. The Midwest had no states with a sideline coverage mandate. There was no significant difference in the number of states with sideline medical coverage mandates between the West (n=3), Northeast (n=4), and South (n=4) regions. Conclusion: This study found that 77% of states and the District of Columbia do not mandate the presence of an ATC, or any other healthcare professionals, to provide sideline medical coverage for high school athletic events, even for high-risk sports such as football. Consequentially, approximately 92% of U.S. high schools represented in our survey do not have a requirement for sideline medical coverage of their athletic events. This widespread absence of state policies requiring sideline medical coverage for high school athletic events may contribute to disparities in the care and safety of student-athletes. These findings underscore the consideration for state-wide mandates to improve access to trained healthcare professionals, such as ATCs, at high school sporting events, especially for high-risk sports such as football.
 
       
07:56 - 08:02 Lecture
Career Duration and Performance Levels of Professional Male Soccer Players in the Top Four English Football Leagues
 
  Andy Williams, MB BS; FRCS; FRCS(Orth.)  |  UNITED KINGDOM
 
   
Description
Career Duration and Performance Levels of Professional Male Soccer Players in the Top Four English Football Leagues Mary Jones, Arman Motesharei, Sam Church, Simon Ball, Andy Williams Objectives Greater understanding of the ‘average’ professional soccer player’s career in terms of longevity and performance level would provide a baseline against which treatments could be measured. Therefore, the aims of this study are to determine the career longevity and performance metrics of male professional footballers playing in the top 4 English football leagues and to demonstrate how these vary according to age, playing position and level played. Methods Football appearance data of all male footballers playing in the top 4 English football leagues between 2005 and 2010 was retrieved from www.fbref.com. Players were grouped into 5 ability levels (English Premier League and international (PLI), Premier league (PL), Championship (C), English Football League 1 (L1) and English Football League 2(L2)) based on the highest level played and career trajectory was tracked according to age. Univariate and multivariate analyses were used to determine differences by position and ability. Kaplan-Meier survival curves were generated to illustrate predicted career lengths. Results Of the 4117 footballers included 3778 (91.8%) were on field players. 1795 (43.6%) played in a minimum of 3 games in the premier league and of these, 856 (47.7%) made at least one appearance for their national side. Goalkeepers had older mean first and last appearance ages (21.8 +3.9 vs 20.0 +3.0 years, p=<0.01 and 33.3 +5.1 vs 30.5 +4.7 years, p=<0.01 respectively) and a longer overall career length (12.4 +4.9 vs 11.6 + 4.7 years, p=<0.01) than on-field players. On-field players reached their highest level at an earlier age (22.0 + 4.0 vs 24.1 +4.5 years, p=<0.01) than goalkeepers and continued to play at their high level for similar periods (4.3 +3.8 vs 4.4 +3.9 year, NS). On-field footballers in the PLI group play at their highest level for over 3 years longer than players in the lower leagues (Figure1). At 5 years PLI and PL on field players have a 60% and 40% probability of continuing to play at their highest level respectively compared to less than 20% chance in the Championship and lower leagues. At 10 years the probability of still playing at their highest level is 40% and 18% in the PLI and PL respectively compared to less than 2% in the lower leagues. Conclusion Career duration in soccer players is affected by the position played and ability level with lower league players having a less than 2% chance of playing at 10 years compared to 40% in international players. These findings can be compared with career longevity and performance after injury to fully understand effectiveness of treatment interventions. To illustrate the value of this data the present study compared it with the published literature reporting career longevity in professional soccer players after ACLR and shows that “still playing” rates in post ACLR players with a mean age of 30 years are up to 12.9% lower than the average “still playing” rates for players of the same age.
 
       
08:02 - 08:10 Discussion
 
 
       
08:10 - 08:16 Lecture
Quest for NonAddictive Pain Control after ACLR
 
  Kurt P Spindler, MD  |  UNITED STATES
 
   
Description
Highlight our recent results at a nonaddictive pain control after ACLR. The goal is not just reduce the use of opoids but elimnate them in the majority of patients. Further nonaddictive approaches should not use other addictive agents like gapabentin, benzodiazapines, and tramadol. The plan is to demonstrate our internal data on results, discuss results systematic reviews, provide details on a current double blind RCT, and on a prospective cohort. The discussion will be facilitated by trying to establish a future multicenter double blind study to change the practice of using narcotics in sports arthroescopic surgery.
 
       
08:16 - 08:22 Lecture
The Impact of Learners on Patient Satisfaction in the Orthopedic Setting
 
  Bradley J Nelson, MD  |  UNITED STATES
 
   
Description
This investigation evaluates the impact of learners and their post-graduate year (PGY) levels on patient satisfaction in the orthopedic outpatient clinic, an area with limited prior research. A retrospective cohort study was conducted using data from July 2020 to December 2022, involving 2,484 patients, with a 39% response rate. Satisfaction was measured via NRC Health surveys, focusing on the likelihood of recommending the provider or clinic based on the presence of learners, categorized as none, present in the clinic, or involved in patient care. Non-parametric statistical analysis revealed significant reductions in satisfaction when learners were involved in care, with top-box scores for recommending providers and clinics decreasing notably (p = 0.030 for providers, p = 0.018 for clinics). The decrease was 7.9% for provider recommendations and 7.2% for clinic recommendations when learners were involved, compared to their absence. Notably, PGY-4 learners were associated with the highest satisfaction levels, highlighting the varied impact of PGY level on patient perceptions. In summary, the presence and involvement of learners in patient care significantly influence patient satisfaction in orthopedic clinics, with the impact varying by the learners PGY level. This suggests a complex interplay between learner engagement and patient satisfaction, emphasizing the need for targeted strategies to enhance educational experiences and patient outcomes in these settings.
 
       
08:22 - 08:30 Discussion
 
 
       
08:30 - 08:36 Lecture
15 Years in the Ring: The Medical Aspects of Professional Wrestling
 
  Jeffrey R Dugas, MD  |  UNITED STATES
 
   
Description
15 Years in The Ring: The Medical Aspects of Professional Wrestling As the medical director or co-medical director for WWE for the past 15 years, the expansion of services, clinical skills, injury prevention, and risk mitigation through a global pandemic have been a few of the issues that have required my attention. The clinical nature of the in-ring injuries has also been a subject of my attention, and I am happy to share these experiences with our society if you think this would be valuable. I will get permission from WWE for any presentation.
 
       
08:36 - 08:42 Lecture
Nazi Medicine: The Good, the Bad, the Ugly
 
  Edward R Mcdevitt, MD  |  UNITED STATES
 
   
Description
The lecture will examine the complex legacy of medical practices during the Nazi regime. It will highlight surgical advances as well as horrific ethical violations. There will be a discussion of the development of anabolic steroids. These drugs were given to athletes as well as to Hitler
 
       
08:42 - 08:50 Discussion
 
 
       
08:50 - 09:05
Break
09:05 - 09:25

Session 2: Knee - ACLR

Pitter 1-2

09:05 - 09:11 Lecture
Revision ACL Outcomes
 
  Rick  W Wright, MD  |  UNITED STATES
 
   
Description
Abstract Background: Revision anterior cruciate ligament (ACL) reconstruction has been demonstrated to have inferior outcomes compared with primary ACL reconstructions in terms of patient-reported outcomes, return to activity and sport, and graft rupture rates. However, the long-term assessment of patients undergoing revision ACL reconstruction remains unknown. Hypothesis: The purpose was to assess long-term outcomes, including graft failure, and signs and symptoms of knee osteoarthritis (OA) at 10 years post-operatively. Methods: Patients were brought back for onsite physical evaluation, which included bilateral range of motion, KT-1000, radiographs and a physical exam by independent blinded sports medicine physicians. Validated PROMs including IKDC, KOOS, WOMAC, and Marx activity rating scale were also obtained. Symptomatic OA was defined by the KOOS Pain subscale < 70 points. Structural OA was defined as a Kellgren-Lawrence grade of 3 or 4 on radiographs. Multivariate regression models were used to determine the predictors for structural and symptomatic OA at 10 years follow-up, controlling for patient’s age, sex, BMI, baseline PROMs, ACL graft choice, prior and current meniscal pathology and treatment at the time of revision surgery, chondral pathology at the time of revision surgery, and incidence of any subsequent surgeries. Results: 205 patients (107 [52.4%] females) returned at average 12-year follow-up (range, 10-16 years). The mean (SD) age at the time of onsite evaluation was 40.2 (10.4) years with a BMI of 25.7 (range, 17.0 – 42.0). Physical exam demonstrated loss of extension in 118 (58%) and extension less than full in 84 (41%). A soft Lachman endpoint was noted in 41 (20%), Lachman >5mm in 20 (10%) and 26 patients (13%) had a grade 2 pivot shift and 4 (2%) had a grade 3 pivot shift. KT-1000 measurements demonstrated 23 (11%) patients with 5mm or greater side-to-side difference. The blinded surgeons in their opinion detected 37 (18%) with a nonfunctional ACL. Radiographs demonstrated that 115 (56%) exhibited joint space narrowing of the tibiofemoral joint (K-L grades 3-4) in their involved knee compared to 28 (14%) in their uninvolved knee. The significant drivers of a higher KL grade (structural OA) at 10 years were found to be higher age, higher baseline BMI, having a medial meniscus excision performed either prior to or at the time of revision surgery, having a prior lateral meniscal excision, or a subsequent surgery (p<0.05). Sex, baseline activity level, graft choice, and chondral pathology at the time of revision were not significant. There were 40 onsite subjects (20%) that reported KOOS pain scores of < 70 points (defined as symptomatic OA), while 91 subjects (44%) reported KOOS pain scores over 90 points (defined as no pain). Conclusion: Outcomes in this revision ACL cohort at minimum 10 years follow-up demonstrates worrisome outcomes at a still young age. This study demonstrated a loss of ROM in 41-58% of the cohort, an 18% graft failure rate, 56% who exhibited KL grades of 3-4, and 20% who reported KOOS pain scores of less than 70 points, which collectively, all emphasize the challenge of managing the revision ACL reconstruction patient.
 
       
09:11 - 09:17 Lecture
ACLR with Multiligament Involvement Can Yield Similar Outcomes to Those with Isolated ACL Tears
 
  K Donald Shelbourne, MD  |  UNITED STATES
 
   
Description
Acute single-stage surgery for MLKIs can restore stability but can also result in high rates of complications, including arthrofibrosis. Instead, treating the torn MCL and PCL nonoperatively and acutely repairing the torn lateral structures for lateral side MLKIs, before doing an ACLR, can be beneficial. Following this treatment philosophy for MLKIs can result in outcomes similar to patients with isolated ACL tears in regard to postoperative laxity, ROM, subjective scores, return to sport, scar resection rate, and graft tear rate.
 
       
09:17 - 09:25 Discussion
 
 
       
09:25 - 10:25

Session 3: Knee - Osteotomy, Biologics & Cartilage

Pitter 1-2

09:25 - 09:31 Lecture
An Osteotomy is the Best Cartilage Repair Method in the Knee
 
  Roland P. Jakob, MD, Professor Emeritus, University of Berne, CH  |  SWITZERLAND
 
   
Description
Knee osteotomies have emerged as one of the most effective strategies for cartilage repair in the knee, offering both biomechanical and biological benefits whereby only addressing underlying malalignment issues that contribute to cartilage degeneration. By redistributing mechanical loads and promoting a more physiological joint environment, osteotomies not only prevent further cartilage degradation but also stimulate intrinsic cartilage repair. Biomechanical Superiority of Osteotomies Knee osteoarthritis and cartilage defects often result from malalignment, where excessive load is concentrated on specific compartments of the knee. High tibial osteotomy (HTO) and distal femoral osteotomy (DFO) serve to redistribute forces more evenly across the joint, reducing focal stress and minimizing further cartilage breakdown. Unlike focal cartilage restoration techniques, which only target localized defects without addressing mechanical contributors, osteotomies provide long-term structural improvements that benefit the entire knee joint. The senior author looks back to 50 yrs. of Osteotomy Experience. He stated the quotation as in this title when ICRS was founded in Fribourg Switzerland in 1997. Roland P. Jakob, Robin Martin
 
       
09:31 - 09:37 Lecture
The Evolution of PSI Osteotomy from Coronal Plane, Sagittal, Rotational, and Tubercle
 
  Anil Ranawat, MD  |  UNITED STATES
 
   
Description
Patient-specific instrumentation (PSI) has become a state-of-the-art tool that offers more precise and customized planning for osteotomies. PSI optimizes bone realignment treatments by utilizing 3D printing, computer-aided design, and preoperative imaging. With the advent of PSI, osteotomy now is on the precipice of approaching the level of technology that is already utilized in arthroplasty. This technology shifts osteotomy from a largely subjective, intraoperative decision-making process to a precise, reproducible approach. As we refine and validate these cutting-edge techniques, PSI has the potential to become the gold standard for osteotomy planning. It improves accuracy in coronal osteotomies for high tibial osteotomy (HTO), sagittal/slope osteotomies for restoring posterior tibial slope (PTS), rotational osteotomies for torsional deformities and tibial tubercle osteotomies for patellar instability. Advantages include enhanced accuracy in bone cuts, reduced surgical time, lower radiation exposure, and improved patient-specific corrections. This integration enhances surgical accuracy, minimizes soft tissue disruption, and improves patient outcomes. Preliminary data suggests improved accuracy when PSI is implemented in sagittal/slope and rotational osteotomies, with a 0.6° error in PTS and -0.2° torsional mean error or -0.2°, respectively. As there is a current paucity of literature on PSI’s role in osteotomy planning, further investigation is essential. We will present our preliminary data and literature review findings as well as demonstrate novel cutting edge techniques for slope correction, tibial tubercle, and derotational osteotomies.
 
       
09:37 - 09:45 Discussion
 
 
       
09:45 - 09:51 Lecture
The Science Behind Clinical Response to OrthoBiologics
 
  Jason L. Dragoo, MD  |  UNITED STATES
 
   
Description
Please insert description of presentation or research.
 
       
09:51 - 09:57 Lecture
Should We Use Platelet-Poor Plasma Rather than PRP for Muscle Injury?
 
  Scott Rodeo, MD  |  UNITED STATES
 
   
Description
Should We Use Platelet-Poor Plasma Rather than PRP for Muscle Injury?
 
       
09:57 - 10:05 Discussion
 
 
       
10:05 - 10:11 Lecture
Bipolar Osteochondral Allograft Transplantation of the Trochlea and Patella
 
  Thomas M DeBerardino, MD  |  UNITED STATES
 
   
Description
Background: Bipolar osteochondral allograft transplantation (BOAT) of the trochlea and patella has emerged as a promising surgical intervention for patients suffering from ICRS grade 3 and 4 cartilage defects and osteochondral lesions of the trochlea and patella. This procedure aims to restore the articular surface, alleviate pain, and improve knee function, thus enhancing the overall quality of life for affected individuals. Osteochondral allograft (OCA) transplantation is an effective treatment option for bipolar chondral and osteochondral defects of the trochlea and patella. Hypothesis: Patients treated with OCAs for bipolar lesions of the trochlea and patella would demonstrate significant clinical improvement. Study Design: Case series; Level of evidence, 4. Methods: Between 2020 and 2025, OCAs were implanted for bipolar chondral lesions in 9 patients (10 knees). The 3 male and 6 female patients averaged 34 years of age (range, 20-50 years). Ten knees (100%) had undergone a mean of 2.5 previous surgeries (range, 1-6). The mean allograft area was 18.0 cm². Clinical evaluation included radiographic imaging at time zero, 6, 12, and 18 weeks, and the International Knee Documentation Committee (IKDC) pain and function, and SANE scores. Further surgeries on the operative joint were documented. Results: Survivorship of the bipolar OCA was 90% at up to 3 years. Two knees underwent further surgery related to the patellofemoral joint and were considered failures (1 OCA revision, 1 patellofemoral arthroplasty). Among patients whose OCA was still in situ at follow-up, the mean follow-up was 2.5 years (range, 8 months to 5 years). Radiographs confirmed good incorporation of all grafts. The mean IKDC pain score improved from 4.7 to 7.5, and the mean IKDC function score improved from 3.4 to 7.0. The mean SANE score improved from 61 to 88. The latest scores will be updated at the meeting. Conclusion: Bipolar osteochondral allograft transplantation of the trochlea and patella offers a viable solution for patients with refractory osteochondral lesions, providing substantial pain relief and functional improvement. Low reoperation and failure rates were observed, and patients with surviving allografts showed significant clinical improvement. While the procedure is associated with certain risks and complications, careful patient selection, refined surgical techniques, and comprehensive post-operative care can mitigate these challenges. Further research, particularly long-term studies, is essential to fully establish the durability and efficacy of BOAT in appropriately indicated patients.
 
       
10:11 - 10:17 Lecture
Gender Mismatch in Osteochondral Allografts
 
  Andreas H Gomoll, MD  |  UNITED STATES
 
   
Description
The presentation will explore the risk factors for osteochondral allograft failure. Previous studies have demonstrated excellent clinical outcomes after osteochondral allograft transplantation. However, a subset of patients experience graft failure/rejection. We hypothesize that donor-recipient sex mismatch may pose as a risk factor for osteochondral allograft failure.
 
       
10:17 - 10:25 Discussion
 
 
       
10:25 - 10:55

Session 4: LEAP Procedures

Pitter 1-2

10:25 - 10:31 Lecture
Consensus on LEAP Procedures
 
  Volker Musahl, MD  |  UNITED STATES
 
 
       
10:31 - 10:37 Lecture
Consensus on LEAP Procedures
 
  Alan Getgood, MD MPhil FRCS(Tr&Orth)  |  QATAR
 
 
       
10:37 - 10:43 Lecture
Consensus on LEAP Procedures
 
  Bertrand Sonnery-Cottet, MD, PhD  |  FRANCE
 
 
       
10:43 - 10:55 Discussion
 
 
       
10:55 - 11:10
Break
11:10 - 11:37

Session 5: Herodicus Traveling Fellows

Pitter 1-2

11:10 - 11:13 Introduction
 
  Chair: Geoffrey S Baer, MD, PhD  |  UNITED STATES
 
 
       
11:13 - 11:19 Lecture
Traveling Fellowship Presentation: Jeffrey Hassebrock
 
  Jeffrey D Hassebrock, MD  |  UNITED STATES
 
   
Description
Traveling Fellowship Presentation
 
       
11:19 - 11:25 Lecture
Traveling Fellowship Presentation: Paul Inclan
 
  Paul Inclan, MD  |  UNITED STATES
 
   
Description
Traveling Fellowship Presentation
 
       
11:25 - 11:31 Lecture
Traveling Fellowship Presentation: Stephanie Boden
 
  Stephanie A Boden, MD  |  UNITED STATES
 
   
Description
Traveling Fellowship Presentation
 
       
11:31 - 11:37 Discussion
 
 
       
11:37 - 11:50

Session 6: The Herodicus Award at AOSSM (2024 Recipient)

Pitter 1-2

11:37 - 11:40 Herodicus Award Recipient Introduction
 
  Chair: David R McAllister, MD  |  UNITED STATES
 
 
       
11:40 - 11:46 The Natural History of Ulnar Collateral Ligament Injuries in Professional Baseball
 
  Joseph Tanenbaum, MD, PhD  |  UNITED STATES
 
   
Description
Objectives: The objective of this study was to quantify the rate and timing of recurrent ulnar collateral ligament (UCL) injuries among elite baseball players. Whereas several prior works focused on rates of return to play and performance after UCL reconstruction, the literature lacks evidence on recurrence rates for UCL injuries, especially for non-operative injuries. Addressing this literature gap is important because of the emphasis that team physicians place on UCL injury history as a determinant of future UCL injury risk. In a landmark study that surveyed Major League Baseball (MLB) team physicians and achieved an 80% response rate, McGahan et al. found that 60% of team physicians rated any prior UCL injury (regardless of injury severity or treatment modality) as “moderate risk” for future injury among pitchers entering the MLB draft. In the same survey, 52% of team physicians rated recent UCL strain as a “severe risk” for future injury among the same player cohort. The present study is the first to use comprehensive data from MLB on UCL injuries to quantify the frequency of recurrence and when these injuries are likely to recur. Quantifying the recurrence rate of UCL injuries is important for players at all levels of competition, including those without a documented injury history. For example, one singlecenter study found that 34% of asymptomatic MLB and Minor League Baseball (MiLB) players screened with a pre-signing MRI had evidence of UCL signal heterogeneity. Alternatively, if the recurrence rate of UCL injuries is relatively low, then players and teams may be inappropriately weighting prior injury as a predictor of future injury risk. This study builds on the work of McGahan et al. by quantifying the recurrence rate of UCL injuries in professional baseball players and defines the typical number of seasons until recurrence. These data will provide critical information to players, team management, and team physicians at all levels of competition with an eye toward better informing health and safety decisions. Methods: This study uses data supplied by Major League Baseball’s Health and Injury Tracking System (HITS) on all MLB and MiLB players from 2010-2021. A comprehensive list of UCL injuries (regardless of severity or initial treatment modality) was generated by reviewing every elbow injury in MLB and MiLB during the study period. Use of this data source marks an important departure from prior studies on similar topics that relied on public injury reports to determine if a player had a UCL injury. Instead, these data are generated by the athletic trainers, team surgeons, and league office and are therefore more comprehensive than earlier studies of similar questions. Within HITS, each player is given a unique player identifier and each injury event is given a unique injury event identifier. Thus, if a player is injured in two separate seasons, the player ID would be present in both years but the event ID would be different. This differentiation allows player tracking over time and to determine when an injury recurs. We calculated the number of UCL injuries in each season of 2010-2016 and then determined the five year recurrence rate. We chose the five year time point because the median professional baseball career length is 5 seasons. We therefore present data on the five year recurrence rate for the 2010-2016 seasons, but rely on data from throughout the study period (2010-2021) to determine those rates. We subsequently determined the median and interquartile range for when a recurrence was most likely to occur. Next, we calculated the five recurrence rate among players whose initial injury was managed non-operatively. Finally, we quantified the rate at which recurrent injuries were managed operatively stratified by initial treatment modality. Results: Throughout the study period (2010-2016), there were 1,766 documented UCL injuries. Of these injuries, 820 (46%) were managed initially with surgery, 177 (10.0%) recurred within five years, with a median of two seasons (Interquartile range [IQR] 1-3 seasons) until recurrence. When a recurrence occurred, 107 players (60.5%) underwent surgery, regardless of initial treatment modality. Among injuries that were initially treated non-operatively (946 injuries), 126 players (13.3%) experienced a recurrence within five years, with a median of two seasons (IQR 1-3 seasons) until recurrence, and 87 players (69.0%) underwent surgery to treat the recurrence. Conclusions: The present study offers the most comprehensive data to date on the natural history of UCL injuries among elite baseball players. As McGahan et al. showed, many team physicians use a history of UCL injury as an indicator of future UCL injury risk. It is therefore important to identify the risk of injury recurrence during the typical professional baseball career. We found a relatively low recurrence rate of 10% within the median professional baseball career length of five years. Even players who were initially treated non-operatively (identified by McGahan et al. as being perceived to be more likely to sustain a future UCL injury) had a relatively low five-year recurrence rate of 13.3%. Importantly, the majority of recurrences underwent surgery, suggesting that the risk tolerance for future recurrences beyond the first recurrence is similarly low. These results highlight the importance of understanding the natural history of common injuries among athletes across all levels of competition, and can be used to inform risk reduction plans for athletes across the competitive landscape.
 
       
11:46 - 11:50 Discussion
 
 
       
11:50 - 12:10

Session 7: Shoulder - Rotator Cuff

Pitter 1-2

11:50 - 11:56 Lecture
Lower Trapezius Tendon Transfer Restores Deltoid Function and Shoulder Stability More Effectively Than Superior Capsular Reconstruction in Massive Rotator Cuff Tears when including Scapulothoracic Articulation
 
  Jason L Koh, MD, MBA  |  UNITED STATES
 
   
Description
Purpose: Massive rotator cuff tears (MRCT) remain a significant clinical challenge and several treatment options are available, including superior capsular reconstruction (SCR) and lower trapezius tendon transfer (LTT). The purpose of this study was to compare the biomechanical effectiveness of SCR and LTT to restore the native shoulder kinematics in MRCT using a dynamic shoulder testing system in a unique cadaveric model that incorporates the scapulothoracic articulation including hemithorax and preserves normal scapular muscle attachments, rather than rigidly fixing the scapula to a frame. Methods: Eight fresh-frozen cadaveric hemithoraces were tested using a custom-made dynamic shoulder testing system. The conditions tested are intact, supraspinatus tear, MRCT (supraspinatus and infraspinatus tear), LTT with Achilles allograft, SCR combined with LTT, and SCR alone. Measurements included cumulative deltoid force, humeral head translation (HHT), and subacromial peak pressure during humeral abduction at various angles. Results: Significant reductions in cumulative deltoid force were observed from intact to MRCT conditions (p = 0.023). LTT alone significantly improved deltoid force compared to its combination with SCR (p = 0.017) and outperformed SCR alone (p = 0.023). The intact condition showed increasing subacromial peak pressure with higher abduction angles, peaking at 541 kPa at 90 degrees. MRCT exhibited the highest HHT and peak pressure, indicating significant instability. LTT reduced HHT and peak pressure compared to MRCT, indicating partial restoration of stability. The combined LTT + SCR condition demonstrated HHT values close to the intact condition and lower peak pressures, indicating substantial restoration of glenohumeral stability. Conclusions: Simulated active unconstrained humeral abduction in the scapular plane using an entire hemithorax model suggests that LTT can restore dynamic stability and deltoid function in MRCTs, while SCR offers static stability without restoring deltoid function. Combining LTT and SCR may result in lower subacromial peak pressures on the undersurface of the acromion than either procedure alone. Clinical Relevance: This study introduces a unique method of assessing shoulder kinetics including the scapulothoracic articulation, and will contribute to understanding shoulder kinetics concerning current surgical techniques and suggest a dynamic concept of shoulder biomechanics testing.
 
       
11:56 - 12:02 Lecture
Minimum 5-Year Outcomes after Reverse Total Shoulder Arthroplasty compared to Superior Capsular Reconstruction for the Treatment of Irreparable Posterosuperior Rotator Cuff Tears in Patients 70 Years Old or Younger
 
   
Description
Background: Treatment of irreparable posterosuperior rotator cuff remains challenging, especially in younger patients. Superior Capsular Reconstruction (SCR) has been encouraged as a joint-preserving alternative to Reverse Total Shoulder Arthroplasty (RTSA). Short-term outcomes are encouraging and show no difference in outcome. There exists a paucity of data on mid-term outcomes. The purpose of the present study was to compare these two techniques at minimum 5-year follow-up. Methods: All consecutive patients (= 70 years) who underwent RTSA or SCR for the treatment of an irreparable posterosuperior rotator cuff tear between 2006 and 2018 were eligible for inclusion after a minimum follow-up of 5 years. Revision, Demographicm and surgical data, as well as pre- and postoperative PROS (SF-12 PCS & MCS, ASES Score, SANE QuickDASH, Satisfaction) were collected and compared. Failure was defined as progression to revision surgery. Results: Twenty-six patients who underwent RTSA and 24 patients who underwent SCR were included (75.4%). Two RTSA patients (7.7%) and 9 SCR patients (37.5%) underwent revision surgery and were excluded from further analysis. Their demographics were significantly different in their respective mean ages at the time of surgery (RTSA, 63.3±4.8 years vs. SCR, 56.5±6.7 years; p< 0.001) and mean follow-up intervals (RTSA, 7.8 years vs. SCR, 6.6 years; p<0.001). Preoperative PRO scores showed no significant differences (all p>0.05). At follow-up, QuickDASH (RTSA: 25.3±19.3 vs. SCR: 10.7±12.9; p=.003), and SF-12 PCS (RTSA: 47.7±8.8 vs. SCR: 46.9±10.4, p=.015) differed significantly between groups. ASES Score, SANE and SF-12 MCS, however, did not differ between groups (all p>0.05). No significant differences were seen regarding postoperative satisfaction groups. Kaplan-Meier curve demonstrated superior survivorship in the RTSA (96.6%) at 5 years compared the SCR group (67.8%) (p=.003). Conclusion: Both procedures significantly improve patient-reported outcomes at mid-term follow-up. However, RTSA demonstrated superior survivorship (96.6%) compared to SCR (67.8%). RTSA appears to be superior in terms of durability for the treatment of young patients. In patients who did not undergo revision surgery, however, SCR was associated with better shoulder function and physical health.
 
       
12:02 - 12:10 Discussion
 
 
       
12:10 - 12:25
Break to Excuse Non-Members
12:25 - 13:30

Business Meeting II (Members Only - Working Lunch)

Pitter 1-2

       
07:00 - 07:45
Breakfast (Kristall Foyer)
Kristall Foyer
07:45 - 07:50

Welcome and Announcements

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    President: Eric C McCarty, MD  |  UNITED STATES
Chair: Walt R Lowe, MD  |  UNITED STATES
   
07:50 - 08:40

Session 1: Knee - Meniscus

Pitter 1-2

07:50 - 07:56 Lecture
Meniscus Saver or Hater? Has new technology changed your practice?
 
   
Description
Presentation will discuss meniscus repair versus meniscectomy, emphasizing newer technologies for root repair and other types of tears previously difficult to repair. The presentation will include ample video showing new techniques for repair and augmentation.
 
       
07:56 - 08:02 Lecture
meniscal scaffolds : where are we know.
 
  Rene Verdonk, MD . PhD  |  BELGIUM
 
   
Description
i suggested this already for the Lugano meeting which was cancelled cfr the Covid issue. the presentation brings an update on CMI now with 20y clinical results and Actifit 10 y documented clin findings. the indications for meniscal scaffolds are several and solutions do not seem to be accesible ....
 
       
08:02 - 08:08 Lecture
Biomechanical Evaluation of Partial Meniscal Transplantation for Horizontal Cleavage Tears in the Medial Meniscus
 
  Jason L Koh, MD, MBA  |  UNITED STATES
 
   
Description
Objectives: The meniscus, a C-shaped cartilaginous structure within the knee joint, is pivotal in maintaining joint function and stability. Its multifaceted functions include load transmission, shock absorption, joint lubrication, anteroposterior joint stability, and proprioception. Traditional treatment has often involved partial meniscectomy and transplantation in response to meniscal injuries, particularly horizontal cleavage tears (HCT), which account for about 32% of meniscal tears. This approach has been favored for its perceived benefits, enabling swift recovery and the resumption of sports activities. However, the long-term consequences of partial meniscectomy, tied to biomechanical disruptions caused by essential meniscal tissue loss, further complicate matters. Meniscal transplant presents the potential for restoring critical meniscal functions while minimizing the adverse outcomes linked to partial meniscectomy, such as an increased risk of arthritis. Our research aims to comprehensively investigate the biomechanical implications of meniscal transplants compared to partial meniscectomy, intact menisci and those affected by HCT. We assessed contact areas and pressures within the knee joint using a human model to show how these surgical interventions affect joint mechanics. Methods: The study involved 7 fresh-frozen human cadaveric knees, from which muscular structures and extensor mechanisms were removed while keeping ligaments intact. To access the tibiofemoral joint, a femoral condyle osteotomy was performed. Pressure-mapping sensors (Tekscan) were placed through a sub-meniscal arthrotomy. Each knee underwent testing at full extension under four conditions (Fig 1): i) intact medial meniscus, ii) 2cm posteromedial horizontal cleavage tear of medial meniscus, iii) partial meniscectomy, and iv) partial medial meniscus transplantation using an allograft tailored to fit the prepared defect. Using a uniaxial load frame (MTS 30/G machine) (Fig 2), tibiofemoral contact pressure and contact area were measured in the medial and lateral compartments at 800 N of axial load, with triplicate measurements for each condition. Results: The experimental results showed distinctive contact pressure patterns (Fig. 3). The intact meniscus displayed a medial peak contact pressure of 2.45±0.41 MPa, while the partial tear showed 2.45±0.52 MPa, meniscectomy exhibited 2.74±0.54 MPa, and transplant demonstrated 2.54±0.15 MPa. On the lateral side, the intact meniscus registered a contact pressure of 2.73±0.16 MPa; the partial tear revealed a higher pressure of 2.61±0.27 MPa, with meniscectomy yielding 2.83±0.31 MPa, and the transplant showing 2.61±0.25 MPa. Notably, statistical analysis revealed no significant differences between each group regarding medial and lateral contact pressures (p < 0.05). However, there was an 11.42% increase in pressure observed between the intact and meniscectomy groups. In comparison, there was a 3.67% decrease, indicating a reduction in contact pressure by up to 7.2% compared to the meniscectomy group. The study also focused on contact areas, revealing medial compartment values of 477.93 mm², 383.29 mm², and 394.08 mm² for partial tear, partial meniscectomy, and partial meniscus transplant conditions. Statistically significant differences emerged between tear and meniscectomy (p = 0.005) and tear and transplant conditions (p = 0.008), but not between meniscectomy and transplant (p = 0.582). Conclusions: The findings hold important clinical implications. Partial meniscal transplantation showed comparable contact areas to partial meniscectomy in full extension. Notably, partial transplantation outperformed meniscectomy across all knees and axial loads by restoring and increasing the contact area. This supports the idea that partial transplantation could be a non-inferior alternative for repairing horizontal cleavage tears. However, it's essential to acknowledge that contact pressure for the partial tear has some limitations, as horizontal cleavage tears are inherently more sensitive and prone to flapping against shear forces rather than compression, which may affect the accuracy of our pressure measurements. These results underscore the potential of partial meniscal transplantation as a viable treatment option. However, further enhancements to surgical procedures, graft shaping, and suturing techniques could impact its outcomes due to its novelty. Continued refinements in this operative approach may improve effectiveness in addressing meniscal tears and enhancing patient outcomes.
 
       
08:08 - 08:20 Discussion
 
 
       
08:20 - 08:26 Lecture
Evaluation of Soft Anchors for Radial and Root Type Meniscus Repair
 
  Lyle Cain, MD  |  UNITED STATES
 
   
Description
Biomechanical and surgical technique evaluating the use of soft anchor fixation for radial lateral meniscus and medial root repairs. Both cadaveric testing and surgical technique will be presented.
 
       
08:26 - 08:32 Lecture
How Successful Are Meniscal Repair All-Inside Implants During Deployment?
 
  David C Flanigan, MD  |  UNITED STATES
 
   
Description
Meniscal tears are one of the most common knee injuries. Symptomatic tears are routinely treated by meniscectomies, which can lead to knee osteoarthritis, or by meniscal repairs that preserve the meniscus but potentially increase reoperation risk. An all-inside meniscus repair utilizes implants to fixate the meniscus at a higher cost than traditional inside out or outside in suturing technique. The success rate of these meniscal implants, however, is unknown. The purpose of this study was to determine the percentage of implants successfully deployed during arthroscopic all-inside repair. Methods A data query of meniscus repair (CPT codes: 29882 and 29883) procedures was performed at a single institution. The query was limited to include procedures performed between June 1, 2020 and June 1, 2023. Multiple different manufacturer implants were used by 5 sports medicine fellowship trained orthopaedic surgeons. The number of implants successfully used and number of implants wasted due to intra-operative failure during meniscal repair were found on EPIC and documented for each procedure. Success rate of meniscal implants was determined by dividing the number of implants wasted by the total amount of implants used. Results The query identified 1026 patients that underwent meniscus repair. From this cohort, 3,867 total meniscal implants for an average of 3.77 implants per case. Overall, all inside meniscus repair was found to have a low implant failure or waste rate (1.03% [n = 40]). The highest failure rates were found with JuggerStitchTM Curved (9.38%), NOVOSTITCHTM Cartridge 0 Suture (2.44%), and TRUESPANTM 12 Degrees (2.11%) implants. Conclusions The most important finding was that the overall failure rate of meniscal implants is low. Implants with higher waste rates should be addressed by industry and considered by surgeons when selecting surgical implants. These preliminary findings establish the necessity to further examine implant failure rate and associated costs of meniscus repair.
 
       
08:32 - 08:40 Discussion
 
 
       
08:40 - 09:30

Session 2: Knee - Meniscus

Pitter 1-2

08:40 - 08:46 Lecture
Medial Meniscus Posterior Root Tear Treatment
 
  Alan Getgood, MD MPhil FRCS(Tr&Orth)  |  QATAR
 
   
Description
Simulated Biomechanical Analysis of Optimal Knee Alignment for Treating Medial Meniscus Posterior Root Tears 1,4Hiranaka, Takaaki; 2Redgrif, Adam; 2Li, Yizhao; 2Madia, Larissa; 2Willing, Ryan; 1,3Getgood, Alan 1 Fowler Kennedy Sports Medicine Clinic, Western University, London, Ontario, Canada, 2 Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada, 3Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar, 4Sydney Orthopaedic Research Institute, St Leonards, NSW, Australia INTRODUCTION: Medial opening-wedge high tibial osteotomy (MOWHTO) corrects varus alignment; however, the optimal knee alignment during MOWHTO for medial meniscus posterior root tears (MMPRT) remains unclear. This study aims to determine the optimal biomechanical alignment for MMPRT treatment. MATERIALS & METHODS: This study utilized ten fresh-frozen cadaveric legs from human donors. A joint motion simulator was used to assess weight-bearing line positions (%WBL) ranging from 30% to 70%, with neutral alignment defined as 50% WBL, simulating MOWHTO. Tibiofemoral mean contact pressure (MCP) was measured using Tekscan sensors in each compartment under a 700 N load. MMPRT models were generated via a femoral posterior approach and repaired with suture anchors. Measurements were obtained for intact, MMPRT, and repair conditions ranging from 30% to 70% WBL. RESULTS: In the medial compartment, MCP increased significantly by 49% in the MMPRT condition compared to the intact condition (p = 0.002), while in the repair condition, the increase was not significant at 8% (p = 0.851). With varus alignment, MCP increased under all conditions, with the largest statistically significant differences observed at 30% WBL (P <0.001). MCP at neutral alignment in the intact condition equaled those at 60–65% and 50–55% WBL in the MMPRT and repair conditions, respectively (Figure 1). In the lateral compartment, MCP increased with valgus alignment, with no significant differences among conditions. DISCUSSIONS: The findings suggest that 60–65% WBL is the optimal biomechanical alignment for unrepairable MMPRT, supporting a previous clinical study targeting 62–62.5% WBL 1. In contrast, 50–55% WBL is adequate for repairable MMPRT. These results emphasize adjusting alignment based on meniscal status and highlight the need for patient-specific strategies. CONCLUSION: The optimal biomechanical alignment for MOWHTO in the treatment of MMPRT is 60–65% WBL for unrepaired cases and 50–55% WBL for repaired cases.
 
       
08:46 - 08:52 Lecture
Immediate Postoperative Weightbearing After Meniscal Root Repair
 
  Lance LeClere, MD  |  UNITED STATES
 
   
Description
Background Following meniscal root repair, currently published post operative protocols typically restrict weightbearing and range of motion immediately following surgery. However, there is a paucity of data to support current standard practices. The goal of this study was to compare long-term outcomes of meniscal root repair for patients with protected immediate postoperative weightbearing versus patients allowed immediate weightbearing as tolerated. Methods A consecutive series of patients from a single institution aged 18 and over that underwent meniscal root repair from 2017-2024 were retrospectively reviewed. Those undergoing additional procedures not including chondroplasty or partial meniscectomy and those with less than 60 days of post-operative follow up were excluded. Patients were divided into three categories based on post-operative weightbearing and range of motion restrictions: restricted weightbearing (touchdown or partial, PWB), weightbearing as tolerated (WBAT-ext) with knee locked in extension, and weightbearing as tolerated without restriction (WBAT). Primary outcome was re-operation on the ipsilateral knee and secondary outcomes included post-operative corticosteroid or viscosupplementation injection and pre- to post-operative changes in a ten-point virtual analog scale (VAS) for pain and PROMIS physical function score. Results A total of 173 patients included for analysis at an average follow up of 8.5 months, of which 37 were PWB, 62 were WBAT-ext, and 74 were WBAT. There were significant differences in the age, initial Kellgren-Lawrence (KL) score, and highest grade of intra-operative chondromalacia between groups with the PWB group being younger with less radiographic arthritis and intra-operative chondromalacia (Table 1). There was no difference in re-operation rate, post-operative injection rate, VAS scores or PROMIS physical function scores between groups. Conclusions There was no significant increase in negative outcomes with immediate post-operative weightbearing without range of motion restrictions in patients undergoing meniscal root repair in this retrospective case series. Patients may be able to achieve similar outcomes without restricting motion or weightbearing post-operatively.
 
       
08:52 - 08:58 Lecture
Impact of Iatrogenic Lateral Meniscus Anterior Root Injury in ACL reconstruction – A Cadaveric Study
 
  Matthew V. Smith, MD  |  UNITED STATES
 
   
Description
Long term follow-up after ACL reconstruction has shown that 18-71% of patients develop osteoarthritis, with increased rates of lateral compartment osteoarthritis in ACL deficient knees. The anterior horn lateral meniscus root (ALMR) in in close proximity to the ACL footprint and is known to be at risk for injury during drilling of the tibial tunnel. Less studied is the impact of iatrogenic injury to the root of the anterior horn of the lateral meniscus (ALMR) during ACL reconstruction. While uncommonly injured, the ALMR plays an important role in load transmission. Disruption of meniscal roots impairs hoop stress transmission potentially accelerating cartilage degeneration. Biomechanical studies evaluating nonrepaired tears and meniscectomies of the anterior horn of the lateral meniscus report a 78% increase in peak contact pressure compared to an intact meniscus, supporting the importance of an intact ALMR on knee kinematics. This cadaveric study aims to elucidate the clinical impact of iatrogenic injury to the anterior horn of the lateral meniscus during ACL reconstruction. No prior cadaveric studies have evaluated what percentage loss of the ALMR after reaming of the tibial tunnel leads to a significant change in contact pressures and contact area in the knee. We hypothesize that damage to the ALMR will increase with larger diameter reamers, resulting in increased contact pressures and decreased contact area in the lateral compartment. This will have a direct impact on clinical practice, with significant results impacting surgeon’s choice of the size of tibial tunnel for ACL reconstruction.
 
       
08:58 - 09:10 Discussion
 
 
       
09:10 - 09:16 Lecture
Return to Sport After ACL Reconstruction With Meniscal Allograft Transplantation Versus Isolated ACL Reconstruction: A Matched-Cohort Study
 
  Walt R Lowe, MD  |  UNITED STATES
 
   
Description
Background: Meniscal allograft transplantation (MAT) is indicated in the setting of anterior cruciate ligament (ACL) reconstruction to restore proper arthrokinematics and load distribution for the meniscus-deficient knee. Objective outcomes after ACL reconstruction with concomitant MAT in athletic populations are scarcely reported and highly variable. Purpose: To compare patient outcomes using an objective functional performance battery, self-reported outcome measures, and return-to-sport rates between individuals undergoing ACL reconstruction with concomitant MAT and a matched group undergoing isolated ACL reconstruction. Study design: Cohort study; Level of evidence, 3. Methods: A single-surgeon ACL reconstruction database (N = 1,431) was used to identify patients undergoing ACL reconstruction with concomitant MAT between 2014 and 2019. Patients were age-, sex-, and revision-matched to a group undergoing isolated ACL reconstruction. Baseline patient and surgical data were obtained. Patients completed an objective functional performance battery at the time of return to sport that included range of motion, single-leg squat performance, single-leg hop test performance, self-reported function (International Knee Documentation Committee [IKDC] score), and psychological readiness (ACL Return to Sports After Injury scale). Between-limb comparisons were assessed using limb symmetry indices. Injury surveillance was conducted for 2-years and included the Single Assessment Numeric Evaluation (SANE), reinjury rates, complications, and current level of sports participation. Between-group comparisons at the time of return to sport and 2 years later were analyzed using generalized linear models for parametric and nonparametric equivalents with an a priori alpha level of .05. Results: A total of 46 patients were included in the ACL reconstruction with concomitant MAT group (38 medial MAT, 8 lateral MAT), and 46 patients were included in the isolated ACL reconstruction group. Baseline differences existed between groups, with the MAT group exhibiting lower body weight (84.0 ± 14.1 vs 93.2 ± 19.8 kg; P = .036) and Marx scores (4.8 ± 4.5 vs 9.3 ± 4.1; P = .024) than the isolated ACL reconstruction group, respectively. At the time of return to sport, the MAT group reported lower IKDC scores (83.2 ± 12.6 vs 91.1 ± 11.3; P = .037); however, no other functional performance or self-reported differences were observed. At 2 years, no significant differences existed between groups for SANE score (87.8 ± 12.3 vs 89.3 ± 11.4; P = .793), ACL graft reinjury rates (6.5% vs 2.2%; P = .688), or level of return to sport (P > .05). The MAT group demonstrated a significantly lower rate of return to previous level of sport (69.5% vs 78.3%; P = .026). Conclusion: The majority of patients (87%) undergoing ACL reconstruction with concomitant MAT were able to return to some level of sports participation at 2 years with a low risk of revision ACL reconstruction or meniscal transplant failure. Patients receiving a concomitant MAT exhibited lower self-reported function at return to sport compared with matched controls undergoing isolated ACL reconstruction; however, these differences were not present at 2 years. Clinicians should consider patient characteristics, self-reported function, and return-to-sport rates when counseling patients regarding ACL reconstruction with MAT.
 
       
09:16 - 09:22 Lecture
Meniscus Allograft Transplantation in 2025: Challenges and Future Directions
 
  Seth L Sherman, MD  |  UNITED STATES
 
   
Description
The purpose is to highlight controversies regarding meniscus allograft transplantation (MAT) in 2025. The intention is to provide a high level overview of innovation gaps with focus on areas of improvement. Topics to debate include surgical indications, technical factors (graft type/sizing, surgical technique, management of mismatch/extrusion), biologic augmentation, rehabilitation, and RTP.
 
       
09:22 - 09:30 Discussion
 
 
       
09:30 - 09:45
Break
09:45 - 10:41

Session 3: Post-op & Outcomes

Pitter 1-2

09:45 - 09:51 Lecture
Post operative arthrofibrosis: Are we getting any better at avoiding this dreaded complication?
 
  Robert Litchfield, MD  |  CANADA
 
   
Description
This session will focus on post-operative or post traumatic arthrofibrosis (knee, shoulder or other) including case-based discussion and introduction of new biologic treatment strategies. This might work well with a panel discussion. We will discuss the following: identification of at-risk individuals, avoidance strategies, treatment plans, what to do and when? New technologies to look for.
 
       
09:51 - 09:57 Lecture
knee flexion contracture after TKA
 
  Rene Verdonk, MD . PhD  |  BELGIUM
 
   
Description
knee flexion contracture is a difficult issue to handle and even more dramatic for the post TKA pts unable to walk. it leads often to revision arthroplasty but can be avoided by posterior capsular release through a medial condylar approach which is much less aggressive allowing much easier recovery to full extention. presentation on midterm results
 
       
09:57 - 10:03 Lecture
Knee - Other
 
  David R McAllister, MD  |  UNITED STATES
 
   
Description
Outcomes and recurrence rates for operatively treated tenosynovial giant cell tumor (TGCT) of the knee
 
       
10:03 - 10:15 Discussion
 
 
       
10:15 - 10:21 Lecture
Female Sex and Skeletal Immaturity increase the risk for Recurrent Instability after Primary Patellofemoral Stabilizing Surgery
 
  Lutul Dashaun Farrow, MD  |  UNITED STATES
 
   
Description
Objectives: To identify risk factors for recurrent instability following a proximal or distal patellofemoral stabilizing procedure in patients with patellofemoral instability Methods: Patients with a history of patellofemoral instability and undergoing primary proximal and distal patellofemoral stabilizing surgery between January 2010 and December 2019 were included. We excluded patients having revision surgery, iatrogenic medial patellofemoral instability, and instability due to congenital disorders. The following data was collected: Age, Sex, BMI, diagnosis (first-time dislocator vs. recurrent dislocator), Surgery (Patellar Tendon imbrication, Lateral Retinacular Release, MPFL Reefing, MPFL Reconstruction, Tibial Tubercle Osteotomy), TT-TG distance (mm), Skeletal Maturity (Immature vs Mature), Caton-Deschamps Index, Recurrent Instability (Yes vs No). Statistical analysis was performed using the chi-square test, student T-test, and multivariate logistic regression. Results: After exclusion criteria were applied, a total of 420 patients were identified, of whom 330 had complete follow-up data (78.6%). Follow up period was 29.5±31.5 months (Table 1). The overall rate of recurrent instability was 6.5%. The mean age was 21.2±8.1 years. There were 212 female and 118 male patients. The mean BMI was 26.8±6.0 kg/m2. There were 32 first-time dislocators and 298 recurrent dislocators. The mean TT-TG was 17.6±6.0mm, and the mean CDI was 1.23±0.1. There was trochlear dysplasia in 121 patients and no dysplasia in 209 patients. Data on surgery types is shown in Table 1. Multivariate regression analysis identified female sex (p=0.02) and skeletal immaturity (p<0.001) as risk factors for recurrent instability (Table 2). The female sex had an Odds ratio of 4.95 (1.34-18.29), and skeletal maturity had an Odds ratio of 0.11 (0.04-0.30). Patients with recurrent instability were significantly younger (17.57y vs. 21.51y, p=0.003). However, age was not identified as a risk factor for recurrent instability. Conclusion: The rate of recurrent instability after a primary patellofemoral stabilizing surgery is 6.5%. Female sex and skeletal immaturity are found to be risk factors for recurrent instability. The female sex has 4.95 times higher risks for recurrent instability, and skeletal immaturity has 9.09 times higher risks. Patients with recurrent instability are significantly younger. However, age was not identified as a risk factor as it likely shared variance with skeletal maturity and sex.
 
       
10:21 - 10:27 Lecture
Patellofemoral Lessons Learned the Hard Way
 
  David R Diduch, MD  |  UNITED STATES
 
   
Description
A variety of anatomic risk factors contribute to patellar instability, and decision making regarding when and how to correct these can be difficult. When things don’t go as planned, lessons are learned the hard way. I will share insights from personal experience treating PF instability patients when outcomes required plans B, C, D… Cases include fractures, non-unions, recurrent instability, jumping J signs, the need for trochleoplasty, when a trochleoplasty doesn’t fix the problem, osteotomies to rotate, angulate, or distalize, physeal tethers to alter growth, cartilage treatment options and how those can fail, and more. Hopefully, others can learn from my experiences and avoid similar problems.
 
       
10:27 - 10:33 Lecture
Minimum 10-Year Prospective Clinical and Radiological Evaluation After Matrix-Induced Autologous Chondrocyte Implantation and Comparison in Athletes and non-Athletes Graft Outcomes.
 
  Ioannis Terzidis, Prof  |  GREECE
 
   
Description
Background: Matrix-induced autologous chondrocyte implantation (MACI) is an established cell-based therapy for the treatment of chondral defects in the knee. However, limited research is available on its longer term (>10 years) efficacy, particularly in Athletes and non-Athletes. Purpose: To evaluate and compare the clinical and radiological outcomes of patients who underwent MACI with a minimum F-up of 10 years, focusing on differences between athletes and non-athletes. Methods: Between November 2007 and July 2013, 36 patients (12 Female/37 knees/48 grafts: 21 medial femoral condyle, 8 lateral femoral condyle, 11 trochlea, 8 patella) who underwent MACI were prospectively evaluated clinically and with magnetic resonance imaging (MRI) preoperatively and at 2, 5, and minimum 10 years after MACI (mean, 13.1 years; range, 10.5-16 years). At the final follow up, 31 patients were available for clinical assessment, with 35 of the 48 grafts evaluated via MRI. Patient-reported outcome measures (PROs) included the Knee injury and Osteoarthritis Outcome Score (KOOS), Tegner Activity Scale, International Knee Documentation Committee (IKDC) score, and Visual Analog Scale (VAS) for pain. Grafts were assessed on MRI using the MOCART system, focusing on tissue infill and overall composite scores. Results: All patient-reported outcome measures improved (P \ .0001) up to 5 years. Specific scores (pre-op/post-op, at 2years/post-op, at 5 years/post-op, at >10 years) were as follows: IKDC score: 39.2 (±21.6)/83.1 (±16.7)/88.3 (±9.7)/ 86.3 (±8.3), Knee injury and osteoarthritis Outcome Score for QoL 31.0 (±2.2)/72.1 (±8.5)/84.5 (±3.7)/ 82.4 (±8.6), Visual Analog Scale for pain 62.9 (±11.6)/95.6 (±1.7)/98.5 (±1.2)/ 94.3 (±3.7). Athletes demonstrated significantly superior KOOS subscale scores for Quality of Life (P = 0.01) and Sports and Recreation (P < 0.001) compared to non-athletes. Conclusion: The findings indicate sustained improvements in clinical outcomes and graft status at minimum 10 years following MACI in both athletes and non-athletes. These results support MACI as a viable long-term treatment option for localized cartilage defects in the knee, highlighting differential outcomes based on patient activity level.
 
       
10:33 - 10:45 Discussion
 
 
       
10:45 - 11:35

Session 4: Knee - Ligaments & Hip

Pitter 1-2

10:45 - 10:51 Lecture
Popliteus Insufficiency Syndrome Study
 
  Jeffrey Alan Guy, MD  |  UNITED STATES
 
   
Description
The popliteus tendon helps provide dynamic external rotation stability to the posterolateral corner of the knee joint. Functional injury to the popliteus is often linked by trauma and usually accompanied by injury to multiple ligaments of the knee. Popliteus insufficiency syndrome is a rare and often unrecognized and potential disabling knee condition in active patients. Symptoms and often subtle and imaging without findings. We present an update to our series of patients previously presented and further qualify Popliteus Insufficiency syndrome
 
       
10:51 - 10:57 Lecture
Arthroscopic Primary Repair of Femoral Sided Posterior Cruciate Ligament Avulsions
 
  Brian D Busconi, MD  |  UNITED STATES
 
   
Description
Case series of 15 patients with 3 year followup with Mri at 1 year to evaluate healing and PROM
 
       
10:57 - 11:03 Lecture
Internal Brace Augmentation for MCL Repair-Does it Ward off Need for Reconstruction????
 
  Claude T. Moorman, MD  |  UNITED STATES
 
   
Description
Internal Brace MCL Augmentation—Good Enough to Ward off Reconstruction??? Background: Internal bracing has shown promise in MCL repair, but biomechanical data comparing repair techniques to both native knee function and each other remains limited. Understanding how these techniques restore normal knee biomechanics is crucial for optimizing surgical approaches. Hypothesis/Purpose: To evaluate the biomechanical properties of MCL repair augmented with single-route InternalBrace® (1IB, sMCL only) versus double-route InternalBrace® (2IB, sMCL and POL) and to assess how these techniques restore native knee biomechanics. Study Design: Controlled laboratory study. Methods: Ten matched pairs of fresh-frozen cadaveric knees (mean age 47.1 ± 8.4 years) underwent MCL injury and repair with either 1IB or 2IB augmentation. Specimens were evaluated for valgus laxity, valgus stiffness, valgus torque, and internal-external rotation at 0°, 15°, 30°, and 60° of flexion. Load-to-failure testing assessed ultimate properties. Statistical analysis employed noninferiority testing for intact state comparisons and superiority testing for between-technique comparisons. Results: Both repair techniques demonstrated noninferiority to the intact state for valgus laxity at early flexion angles, with differences less than 1° at 0° flexion. At 30° flexion, only the 2IB repair maintained noninferiority to the intact state, though the magnitude of difference between techniques was small (0.23°). For external rotation, while both repairs achieved noninferiority at 15° flexion, neither maintained this at higher flexion angles, with 1IB showing a trend toward better performance. Internal rotation testing revealed neither repair established noninferiority to the intact state at 0° flexion, and the 2IB repair showed a trend toward greater constraint of internal rotation at higher flexion angles (30° and 60°), though these differences did not reach statistical significance. Load-to-failure testing showed comparable ultimate properties between techniques (1IB: 87.1 ± 3.3 Nm; 2IB: 80.4 ± 3.3 Nm; p = 0.691), with consistent FiberTak® anchor failure mechanisms. Conclusion: Both internal bracing techniques demonstrated the ability to restore many aspects of native knee biomechanics, though neither fully replicated intact knee behavior across all testing parameters. The addition of POL augmentation did not demonstrate clear biomechanical advantages over single-route fixation. Clinical Relevance: These findings suggest single-route internal bracing may be sufficient for most MCL repairs, as the additional complexity of POL augmentation did not provide substantial biomechanical benefits in our testing model. This data suggests that Reconstruction may not be necessary in most cases of MCL injury requiring surgery as native state restored to near-intact resistance profile. Key Terms: Medial collateral ligament, internal brace, posterior oblique ligament, knee biomechanics, ligament repair
 
       
11:03 - 11:15 Discussion
 
 
       
11:15 - 11:21 Lecture
Return to Sport in Professional Athletes Following Microfracture
 
  Marc J Philippon, MD  |  UNITED STATES
 
   
Description
Osteochondral injuries of the hip can result in significant damage to the acetabulum and femur, leading to adverse symptoms and decreased quality of life. In professional athletes, these defects may lead to decreased athletic performance and potentially premature cessation of an athlete’s career. Treatment of full-thickness cartilage lesions in the hip has been controversial, however microfracture has proven to be an effective treatment option. In high-level athletes, microfracture has resulted in a high rate of return to sport. Currently, data is limited assessing return to play and patient outcomes following microfracture in professional athletes. This presentation aims to share the return to play rates and outcomes of professional athletes treated at our institution with a microfracture procedure for osteochondral lesions of the hip. The proposed session would allow for discussion and debate surrounding the optimal indications for the microfracture procedure in professional athletes, with sport-specific sub-analysis enabling insight into the outcomes of a diverse range of athletes.
 
       
11:21 - 11:27 Lecture
Risk Factors and Rates Of Hip Fracture Following Hip Arthroscopy
 
  Michael B Banffy, MD  |  UNITED STATES
 
   
Description
Introduction A devastating complication of hip arthroscopy is a proximal femur fracture. It is currently unclear what national rates of postoperative proximal femur fracture are and what patient-specific risk factors are associated with them. Methods Patients who underwent hip arthroscopy between 2010 and 2023 were identified using Current Procedural Terminology (CPT) codes using Pearldiver, a publicly available database. Rates of proximal femur fracture were determined using International Classification of Diseases, Ninth and Tenth Revision (ICD-9, ICD-10). Annual rates of proximal femur fracture were analyzed. Categorical and continuous risk factors were compared using chi-square and student test, respectively. Results Among 100,397 hip arthroscopies performed between 2010-2023, 1,054 patients sustained a postoperative proximal femur fracture within five years following surgery (1.05%). Overall, annual rates of proximal femur fractures decreased over the 14 year period, with the most sustained reductions observed following 2016. Patients sustaining postoperative proximal femur fractures were significantly older (49.0y vs. 39.5y), had higher rates of diabetes (22% vs 8%), rates of smoking (41% vs 19%), and rates of obesity defined as body mass index greater than 30 (29% vs 17%). There were no significant differences related to sex (69% female vs 67%). Discussion/Conclusion Overall rates of proximal femur fracture following hip arthroscopy between 2010-2023 were low (1.05%). The greatest reduction in fracture rates were observed following 2016: 63% of fractures occurred between 2010-2015, and 37% between 2016-2023. This may be due to improved surgical technique, but also correlates with the advent of postless hip arthroscopy. We demonstrated various risk factors including increased age, diabetes, smoking, and obesity for fracture, consistent with other studies demonstrating their effect on fracture risk. While rates of hip fracture following hip arthroscopy are low, understanding of modifiable patient risk factors may help reduce rates of this complication.
 
       
11:27 - 11:35 Discussion
 
 
       
11:35 - 11:40

Closing Ceremonies

Pitter 1-2

11:35 - 11:40 Passing the Gavel & Adjourn
 
  President: Eric C McCarty, MD  |  UNITED STATES
 
  Chair: Walt R Lowe, MD  |  UNITED STATES
 
 
       

Annual Meeting Godparent : Richard Rokos

Finished as one of the most successful coaches across all sports in school history, winning eight NCAA championships (1991-95-98-99-2006-11-13-15) with nine runner-up finishes and six third place efforts (or 23 top three performances in 31 tries) … The eight national titles are tied for the most by any coach in CU annals (Mark Wetmore has coached eight in cross country); they are the most in skiing, as he bested Bill Marolt’s seven in men’s skiing from 1972-78 … Marolt, who would become CU’s athletic director, named Rokos as head coach on July 3, 1991 … He and his staff coached 46 individual NCAA champions, included three in his final hurrah that brought CU’s all-time total to 100 … During his tenure, 247 skiers earned All-America honors, including first-team on 150 occasions (44 of whom earned two-time first-team honors in the same year) … Also piloted his teams to 14 Rocky Mountain Intercollegiate Ski Association titles, with CU skiers claiming 65 RMISA/NCAA West Regional titles (the meet served as both) … Named the United States Collegiate Ski Coaches Association National Coach of the Year on five occasions, last in 2015 … The 2006 Buffs performed the greatest comeback within the NCAA’s in history; in sixth-place and down by 52 points after the first day, CU rallied to assume the lead after day three (six events) and won going away by 98 points … His 31 teams competed in 187 collegiate races over his career, winning 73 times and finishing second on another 66 occasions; that’s a top two finish 74 percent of the time (with 28 third place efforts, his teams finished out of the top three just 20 times and out of the top four just four times) … Prior to being named head coach, he was an assistant under Tim LaVallee for the Buffs, coaching the Alpine “B” team for two years before being promoted to alpine coordinator for the 1990 season … A dual citizen of the United States and the Czech Republic, he escaped with his family from communist Czechoslovakia in 1980, making it to the States (Detroit) via Austria, where he and his wife, the former Helena Konecny, and then-18-month-old daughter Linda, spent a year preparing their visas (they moved to Colorado in 1982 and have made it their permanent home) … An ordained minister, he has performed nearly 40 marriages, including at least 20 that involves CU coaches and athletes … He was born May 25, 1950 in Brno, Czechoslovakia.