Primary Hip Arthroscopy is Associated with Earlier Achievement of Substantial Clinical Benefit Compared to Revision Hip Arthroscopy for Femoroacetabular Impingement Syndrome.

To compare time to achievement of clinically significant outcomes (CSOs) between patients undergoing primary and revision hip arthroscopy (HA) for femoroacetabular impingement syndrome (FAIS). Patients undergoing primary and revision HA for FAIS with complete 6-month, 1-year, and 2-year Hip Outcome Score - Activities of Daily Living (HOS-ADL) and Sport Subscale (HOS-SS) were identified. Revision patients were propensity matched 1:4 to primary HA patients, controlling for age, sex, and body mass index (BMI). Time to achievement of minimal clinically important difference (MCID) and substantial clinical benefit (SCB) were compared alongside cumulative CSO achievement at 6, 12, and 24 months. Hazard ratios (HR) for predictors of earlier CSO achievement were identified with multivariate Cox regressions. Fifty revision HA patients were propensity-matched to 200 primary HA patients of similar age, sex, and BMI. Primary HA patients demonstrated a greater prevalence of regular preoperative physical activity (87% vs. 59%, p<0.001). Primary HA patients showed significantly greater SCB achievement for HOS-ADL at 6, 12, and 24 months (p<0.001) and significantly greater SCB achievement for HOS-SS at 12 and 24 months (p≤0.001) compared to revision HA patients. Primary HA patients achieved SCB for HOS-ADL (p<0.001) and HOS-SS (p=0.015) quicker than revision HA patients. Predictors of earlier CSO achievement included preoperative PRO score (HR: 0.98-1.02, p≤0.007), lower BMI (HR: 0.97, p=0.038), presence of physical activity (HR: 1.51, p=0.038), and absence of revision status (HR: 0.52-0.56, p≤0.019). Primary HA patients showed a quicker time to SCB achievement for HOS-ADL and HOS-SS compared to revision HA patients. Preoperative PRO score, lower BMI, regular physical activity, and primary HA status predicted earlier CSO achievement. Level III, retrospective comparative series.

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