FP11.4 Cam Lesion Size Predicts Severity of Chondral Labral Junction Breakdown

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ID: 330972
2026
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Abstract
Abstract ICLB11 - The Biologic Arsenal: Essential Cartilage Repair and Orthobiologics in Early Osteoarthritis, Session Room 12 (BMCC Level 3), October 9, 2026, 10:30 - 12:30 Introduction The chondral labral junction (CLJ) is where the acetabular labrum joins the articular cartilage and damage to this transition zone has shown to portend worse outcomes after hip arthroscopy. The purpose of this study was to explore the relationship of predictive variables to CLJ breakdown. Methods This was a retrospective review of prospectively collected data for patients who underwent primary hip arthroscopy to treat symptomatic labral tears between 2015-2023. Patients were excluded if they had hip dysplasia, previous ipsilateral hip surgery, or missing preoperative symptom duration surveys. The examined preoperative variables included symptom duration, lateral center edge angle (LCEA), and alpha angle (AA). Fellowship-trained orthopaedic surgeons measured LCEA and AA to quantify the extent of pincer and cam lesions, respectively. CLJ breakdown was stratified into two groups: mild (Beck classification≤2) and severe (Beck classification>2). Linear logistic models were used to correlate preoperative variables with CLJ breakdown. Cam lesions were measured on both a standing AP and 45° Dunn lateral views, and the highest value was recorded. A minor cam lesion was defined as 55°≤AA<78°, a major cam lesion as AA≥78°, and AA<55° was normal. Results A total of 143 patients (age, 32.4±9.3) were included in the final analysis; 68 of whom are female, and 75 are male. The linear regression model displayed that AA was able to predict severe CLJ breakdown (OR 1.05, 1.03-1.08, P<0.0001). Symptom duration (OR 1.01, 0.99-1.02, P=0.164) and LCEA (OR 1.06, 0.99-1.13, P=0.092) did not have any significant results. This prompted further stratification of cam lesion size into minor and major groups, with the normal anatomy group being the reference. This displayed a statistically higher risk of severe CLJ breakdown for major cam lesions (OR 8.39, 2.70-32.24, P < 0.0001). Minor cam lesions (OR 1.49, 0.71-3.15, P=0.294) were not predictive of CLJ breakdown. Symptom duration (OR 1.01, 1.00-1.02, P=0.271) and LCEA (OR 0.95, 0.43-2.08, P=0.90) remained insignificant predictors of CLJ breakdown. Conclusion Cam lesion size, measured by preoperative alpha angle, was a strong predictor of CLJ breakdown. Stratification into major and minor cam lesions revealed an eightfold increased likelihood of severe CLJ breakdown. These findings offer clinically valuable information that is otherwise only reliably obtained intraoperatively.
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Authors Brandon Allen, Jackson Woodrow, Rachel Poutre, Rishi Earla, Jeffrey S. Mun, Stephen Gillinov, Bilal S. Siddiq, Nathan J. Cherian, Solomon Williams, Adarsh Aratikatla, Ryan Dean, Peter Baglien, Scott David Martin
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.084
URL
https://doi.org/10.1093/jhps/hnag043.084
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