EP8.5 Relative Central Joint Space Narrowing Correlates with Worse Functional Outcomes In Patients Undergoing Bilateral Hip Arthroscopy

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ID: 331103
2026
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Abstract
Abstract Introduction Absolute joint space width (JSW) has been correlated with higher rates of total hip arthroplasty (THA) after hip arthroscopy. However, relative joint space narrowing has not been used to correlate patient-reported outcome measures in patients undergoing bilateral hip arthroscopy. Therefore, the purpose of this study is to determine if relative joint space narrowing correlates with worse PROMs at 2-year follow-up. Methods This was a retrospective review of prospectively collected data for patients who underwent bilateral primary hip arthroscopy to treat symptomatic labral tears between 2014-2022. Patients were excluded if they had JSW<2mm, or unilateral hip arthroscopy. JSW was measured on a preoperative, standing AP pelvis radiograph at 10° (lateral), 30° (central), and 50°(medial) relative to the 0° line drawn from the center of the femoral head to the lateral edge of the sourcil. JSW differences at each angle were calculated by subtracting the width of the operative hip from the width of the nonoperative hip. Outcomes were compared between the index and contralateral hips. JSW was defined by which hip relative JSW narrowing (>0.01 narrowing) was present at each fixed location. A Spearman correlation analysis was used to correlate joint space narrowing with worse outcomes at each location using iHOT-33, NAHS, mHHS, HOS-ADL, HOS-SSS, and LEFS. Results A total of 20 patients (40 hips) (age, 35.5±10.1; 40% female) were included in the final analysis. Relative joint space narrowing significantly correlated with worse baseline symptoms for the only the central measurement at baseline for mHHS (Rho: 0.526, P=0.022), NAHS (0.563, P=0.015), iHOT (0.558, P=0.017). Relative joint space narrowing did not correlate with worse outcomes at 2-year follow-up (Figure 1). Conclusion This study found that more central joint space narrowing correlated with worse baseline PROM scores than the contralateral side at baseline. Any differences subsided 2-years postoperatively. This suggests that in patients presenting with bilalteral symptoms, relative joint space narrowing can help guide shared decision-making and manage patient expectations.
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Authors Brandon Allen, Jackson Woodrow, Rachel Poutre, Rishi Earla, Jeffrey S. Mun, Stephen Gillinov, Bilal S. Siddiq, Nathan J. Cherian, Adarsh Aratikatla, Destiny Kluck, Scott David Martin, Solomon Williams
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.387
URL
https://doi.org/10.1093/jhps/hnag043.387
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