FP9.5 Prior Hip Arthroscopy Is Associated with Worse Outcomes and Decreased Satisfaction after Total Hip Arthroplasty in Non-arthritic Female Patients: a Comparative Study

Abstract

Abstract ICLB09 - The Revision Playbook: Advanced Execution and Technical Rescues in Failed Preservation, Session Room 6 (BMCC Level 3), October 9, 2026, 10:30 - 12:30 Purpose To compare one-year patient-reported outcomes and satisfaction following primary total hip arthroplasty (THA) in young adult female patients with non-arthritic hips (NAH) versus those with a history of prior hip arthroscopy (NAH+PHA). Hypothesis Female patients with a prior hip arthroscopy would demonstrate lower functional outcomes and reduced satisfaction at one year following THA compared with females undergoing primary THA without prior arthroscopy. Methods This retrospective, multicenter database study included consecutive female patients aged 30–50 years who underwent primary THA between 2019 and 2024 and had complete one-year outcome data. Baseline demographic and radiographic variables collected included age, Tönnis grade, lateral center-edge angle (LCEA), and acetabular index (AI). Patient-reported outcomes assessed preoperatively and at one year included PROMIS Physical Function (PF), the International Hip Outcome Tool-12 (iHOT-12), and a 0–10 satisfaction score. The study was powered a priori to detect a clinically meaningful change in PROMIS PF, with a minimum sample of 17 patients per group required; statistical significance was defined as p ≤ 0.05. Between-group comparisons used appropriate parametric or nonparametric tests; within-group changes were evaluated with paired analyses. Patients who underwent secondary ipsilateral procedures prior to the one-year assessment were excluded from the one-year outcome analyses. Results The NAH cohort comprised 99 female patients (mean age 47.0 years), with 43% Tönnis grade 0 and 57% Tönnis grade 1; mean LCEA/AI was 27.0°/5.3°. The NAH+PHA cohort included 45 female patients (mean age 41.9 years), with 37% Tönnis grade 0 and 63% Tönnis grade 1; mean LCEA/AI was 28.0°/5.8°. Both cohorts experienced significant within-group improvements in general and hip-specific function at one year. PROMIS PF increased from 38.2 to 48.6 in the NAH group and from 36.7 to 44.86 in the NAH+PHA group; the between-group difference in one-year PROMIS PF favored the NAH cohort and reached statistical significance (p = 0.049). iHOT-12 scores improved markedly in both groups but to a greater degree in the NAH cohort: NAH from 33.27 to 74.79 versus NAH+PHA from 30.57 to 56.05 (between-group difference p = 0.008). Satisfaction scores were high overall but significantly higher in the NAH cohort (mean 8.9) compared with the NAH+PHA cohort (mean 7.8; p = 0.05).