EP9.16 Increased Pelvic Drop and Femoral Adduction Are Associated with Improved Preoperative Outcomes In Patients Undergoing Hip Arthroscopy For Treatment Of Femoroacetabular Impingement: A Prospective Study
Abstract
Abstract Introduction During walking, pelvic drop (PD) and compensatory femoral adduction (FAD) are key coronal plane gait features that reflect hip and pelvic control. The present study evaluated their associations with preoperative patient-reported outcomes (PROs) and demographic factors in patients undergoing hip arthroscopy for unilateral femoroacetabular impingement syndrome (FAIS). Methods All eligible patients with unilateral FAIS undergoing primary hip arthroscopy were identified from a prospective hip preservation registry. Preoperative gait analysis was performed using wearable inertial measurement units during level walking. Peak PD and FAD were extracted from the gait analysis. Patient characteristics (age, sex, body mass index) and preoperative PROs—including the International Hip Outcome Tool (iHOT-12), Hip Outcome Score – Sport Specific Subscale (HOS-SSS), Patient-Reported Outcome Measurement Information System (PROMIS) Pain Interference, Physical Function, Depression, Anxiety, and EQ-5D VAS—were collected. Associations between gait variables, demographics, and PROs were assessed using regression analyses. Results A total of 57 patients were included in the study (mean age 32.8±12.8 years; 64.9% female; and mean BMI 25.9±4.4 kg/m2). Median PD was 4.9° (range, 0.4–8.8°), and median FAD was −0.2° (range, −11.2–9.1°). PD was not associated with age, sex, or body mass index (all p > 0.05). On regression analysis, greater PD was associated with higher iHOT-12 (p = 0.025) and EQ-5D VAS scores (p = 0.005), while greater FAD was associated with higher iHOT-12 scores (p = 0.047). Conclusion Pelvic drop and femoral adduction were associated with preoperative PROs in patients undergoing hip arthroscopy for treatment of FAIS. PD and FAD were not associated with age, sex, or BMI of the patient. Greater PD was associated with better hip-specific function, suggesting that compensatory coronal plane gait mechanics may serve to reduce pain and improve function in patients with FAIS.