TP8.8 Relative Central Joint Space Narrowing Leads to Worse Outcomes After Hip Arthroscopy at 5-Year Follow-up

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ID: 331339
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 compared with patient-reported outcome measures. Therefore, the purpose of this study is to determine if relative joint space narrowing influences PROMs at 5-year follow-up. Methods This was a retrospective review of prospectively collected data for patients who underwent primary hip arthroscopy to treat symptomatic labral tears between 2014-2021. Patients were excluded if they had JSW<2mm, or contralateral hip surgery. 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. Cohorts were stratified by the presence (>0.01 narrowing) or absence of relative JSW narrowing at each fixed location. A linear regression model was used to assess relative JSW narrowing at each location using iHOT-33, NAHS, mHHS, HOS-ADL, HOS-SSS, and LEFS. Further stratification was performed based on significant results from the regression model. Results A total of 98 patients (age, 39.4±11.3; 50% female) were included in the final analysis. After adjusting for relative joint space narrowing across all locations, significant results were observed only for the central measurement for iHOT-33 (P=0.043), NAHS (P=0.048), HOS-SSS (P=0.010), HOS-ADL (P=0.039), and LEFS (P=0.034). Upon stratification by central JSW narrowing, there were no differences in patient demographics or radiographic findings. At 5-year follow-up, patients with central narrowing displayed worse scores for NAHS (P=0.032), HOS-SSS (P=0.010), iHOT-33 (P=0.044), and LEFS (P=0.026). Conclusion This study found that relative central joint space narrowing is associated with significantly worse outcomes at 5-year follow-up after hip arthroscopy, even after adjusting for lateral and medial joint space narrowing. Additionally, central joint space narrowing was independently associated with worse PROM scores at 5 years postoperatively. Relative joint space width can be used to help assess preoperative risk and help 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 Cherian, Ryan Dean, Blake C. Meza, Adarsh Aratikatla, Aidan Crawford, Scott David Martin, Solomon Williams
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.178
URL
https://doi.org/10.1093/jhps/hnag043.178
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