FP17.8 Pre-symptom Walking, Running, and Jumping Biomechanics Do Not Identify Athletes Who Develop Femoroacetabular Impingement Syndrome

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ID: 331042
2026
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Abstract
Abstract ICL17 - The Full Picture: Shaping the Future of Global Hip Preservation, Ground Floor Session Room (BMCC Level 0), October 9, 2026, 14:00 - 16:00 Background Individuals with femoroacetabular impingement syndrome (FAIS) demonstrate altered lower extremity (LE) biomechanics when squatting, walking, and running. However, it is unknown whether these pathomechanics are present prior to symptom onset or develop secondary to pain. This study examined whether LE biomechanics during walking, running, and countermovement jumping (CMJ) differ between asymptomatic athletes who later develop symptomatic FAIS and underwent hip arthroscopy (HA) and healthy matched controls. Methods Fourteen NCAA Division I collegiate athletes (5 female; age 18.5±0.9 years; BMI 23.2±2.5 kg/m2) who later underwent HA for FAIS (Pre-HA) and 14 healthy controls (5 female; age 18.6±0.9 years; BMI 24.4±2.9 kg/m2) matched by sex, sport, sport position, and BMI, were included. Whole-body kinematics and ground reaction forces (GRF) were recorded during walking (1.2 m/s), running (4.4±0.2 m/s), and CMJ on an instrumented treadmill during standardized testing for healthy athletes. Medical records confirmed no symptoms before/at testing for the Pre-HA group. Eight athletes underwent staged bilateral HA; all were asymptomatic bilaterally at testing, and the limb that underwent initial surgery was designated as the primary surgical limb. Statistical parametric mapping (SPM) compared hip, knee, and ankle joint kinematics, kinetics, and GRFs during stance phase of walking and running, and takeoff and landing of CMJ between the Pre-HA group primary surgical limb and 1) healthy controls and 2) Pre-HA group contralateral limb. Results During walking, anterior-posterior GRF was significantly greater in healthy controls during 90.9-92.3% of stance (mean difference: 0.36±0.02 N/kg [6.54±0.03%], p=0.04) compared to the Pre-HA group. No other significant differences were detected between groups for LE joint kinematics or kinetics during walking, running, or CMJ (all p’s>0.05). Within the Pre-HA group, no significant between-limb differences were detected across any task (all p’s>0.05). Conclusions LE biomechanics during walking, running, and CMJ did not differ meaningfully between asymptomatic athletes who later developed symptomatic FAIS and healthy controls. Pre-symptom biomechanical screening using these tasks is unlikely to identify athletes at risk for developing FAIS. Assessing tasks with greater potential for impingement (e.g., deep squat, single-leg squat, step-down pivot-turn, sprinting) may better identify early biomechanical markers associated with FAIS onset.
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Authors Matthew L. Kuik, Allison Faber, Daniel G. Cobian, Bryan C. Heiderscheit, Andrea M. Spiker, Keith A. Knurr
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Journal Journal of hip preservation surgery
Year 2026
DOI
10.1093/jhps/hnag043.136
URL
https://doi.org/10.1093/jhps/hnag043.136
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