EP8.25 Changes in Hip Muscular Strength Are Associated with Changes in Specific iHOT-12 Item Scores in Patients with Femoroacetabular Impingement Syndrome Undergoing Hip Arthroscopy

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ID: 331156
2026
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Abstract
Abstract Purpose To identify how changes in hip muscular strength relate to changes in specific aspects of hip-related quality of life following hip arthroscopy for femoroacetabular impingement syndrome (FAIS). Methods Patients with FAIS undergoing hip arthroscopy were included. individual aspects of hip-related quality of life were assessed by ihot-12 item scores. Hip muscle strength was assessed isokinetically for abduction, adduction, external and internal rotations. All assessments were conducted preoperatively and at least in one postoperative timepoint (4, 8 or 12 months). Changes in iHOT-12 item scores and hip torque were calculated as the earliest postoperative timepoint available for each patient minus preoperative values. Separate linear regression models were performed for each item–torque combination, with the variation in item score as the dependent variable and variation in torque as the main predictor, adjusted for sex and age. Partial R2 values were computed to quantify the variance in item change uniquely explained by torque variation. Results A total of 61 participants (40.7±10.5 years; 50.8% women) were included. Hip abduction and adduction strength changes were associated with changes in item 3 (Long-Distance Walking) (Partial R2=0.09, p=0.02, n=60; and Partial R2=0.08, p=0.03, n=60; consecutively), while adduction torque was also associated with item 7 (Post-Activity Pain) (Partial R2=0.12, p=0.007, n=58). No associations were confirmed for external and internal rotation torques. Conclusion Improvements in hip abduction and adduction strength were associated with improvements in walking tolerance and reductions in post-activity related pain. These domains are biomechanically linked to frontal-plane hip stability and load modulation during repetitive single-leg stance tasks. Restoration of abductor and adductor strength may therefore contribute to improved load tolerance following arthroscopy for FAIS. The small explanatory power and lack of association for several items reflect the multidimensional nature of quality of life in FAIS, which is not fully captured by strength. Analysing item-level changes may provide clinically relevant insights not captured by the total iHOT-12 score, and interventions aimed at improving muscular strength may influence specific aspects of quality of life, but not all.
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Authors Bruno Dorneles, PhD Marcelo Peduzzi Castro de PT, MD Richard Prazeres Canella, PhD Heiliane de Brito Fontana PT
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.405
URL
https://doi.org/10.1093/jhps/hnag043.405
Keywords Keywords not found

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