2025 ISAKOS Biennial Congress ePoster
Os Acetabuli Do Not Portend Inferior 2-Year Functional Outcomes In Patients Undergoing Arthroscopic Acetabular Labral Repair
Bilal Siddiq, BS, Boston UNITED STATES
Michael C. Dean, BA, Boston, MA UNITED STATES
Stephen M. Gillinov, AB, New Haven, CT UNITED STATES
Jonathan S. Lee, BA, Boston UNITED STATES
Kieran Sinclair Dowley, BA, Boston, Massachusetts UNITED STATES
Nathan J. Cherian, MD, Somerville, Massachusetts UNITED STATES
Jeffrey S. Mun, BA UNITED STATES
Brandon J. Allen , BA, Boston , Massachusetts UNITED STATES
Scott D. Martin, MD, Boston, MA UNITED STATES
Massachusetts General Hospital, Boston, MA, UNITED STATES
FDA Status Not Applicable
Summary
Os acetabuli were not found to be associated with differential 2-year functional outcomes or rates of achieving clinically meaningful improvements.
Abstract
Introduction
To investigate whether os acetabuli influence 2-year functional outcomes following arthroscopic acetabular labral repair.
Methods
Prospectively collected data from patients undergoing primary hip arthroscopy by a single, fellowship-trained sports medicine surgeon were retrospectively reviewed. Inclusion criteria were age ≥18 years and completion of patient-reported outcome measures (PROMs) preoperatively and at 3-, 6-, 12-, and 24-month follow-up. Exclusion criteria were labral debridement, hip dysplasia, advanced hip osteoarthritis (Tönnis grade >1), or previous surgery on the ipsilateral hip. Patients were divided into cohorts based on the presence of an os acetabulum identified on preoperative anteroposterior (AP) radiographs. Primary outcomes collected included the International Hip Outcome Tool (iHOT-33) and modified Harris Hip Score (mHHS). Secondary outcomes were the Hip Outcome Score-Activities of Daily Living, Hip Outcome Score-Sports Subscale, Non-Arthritic Hip Score, and visual analog pain scale. Inter-cohort outcomes were compared using linear mixed-effects modeling and Fisher’s exact tests. Nonlinear improvement trajectories were accounted for by sensitivity analyses.
Results
193 hips (49.2% female; mean±SD age, 35.9±11.0) were included in the final analyses. Of these, 25 (13.0%) had an os acetabulum. No significant differences in iHOT-33 (weighted difference: 0.09; 95% CI: -6.81, 6.98; p=0.98) or mHHS scores (weighted difference: 2.93; 95% CI: -2.13, 7.98; p=0.26) were found between patients with versus without os acetabuli across the 2-year follow-up period. Additionally, there were no significant differences in rates of achieving clinically meaningful outcomes (p>0.05 for all), revision arthroscopy (p=.342), heterotopic ossification formation (p>.999), or conversion to total hip arthroplasty (p>.999). These results were upheld across sensitivity analyses.
Conclusions
Os acetabuli were not found to be associated with differential 2-year functional outcomes or rates of achieving clinically meaningful improvements. Thus, appropriately managed os acetabuli are not a contraindication to arthroscopic labral repair.