Abstract
Objectives
Reduced sports function is often observed after hip arthroscopy for femoroacetabular
impingement syndrome (FAIS). Impaired muscle strength could be reasons for this. We
aimed to investigate hip muscle strength after hip arthroscopy for FAIS and its association
with sports function and participation.
Design
Cross-sectional study.
Methods
We included 45 patients (34 males; mean age: 30.6 ± 5.9 years) after unilateral hip
arthroscopy for FAIS (mean follow-up [range]: 19.3 [9.8–28.4] months). Maximal isometric
hip muscle strength (Nm/kg) including early- (0–100 ms) and late-phase (0–200 ms)
rate of torque development (Nm∗kg−1∗s−1) for adduction, abduction, flexion, and extension was measured with an externally
fixated handheld dynamometer and compared between operated and non-operated hip. Associations
between muscle strength and self-reported sports function and return to sport were
investigated.
Results
For maximal hip muscle strength, no between-hip differences were observed for adduction,
abduction, flexion, and extension (p ≥ 0.102). For rate of torque development, significantly lower values were observed
for the operated hip in flexion at both 0–100 ms (mean difference: 1.58 Nm∗kg−1∗s−1, 95% CI [0.39; 2.77], p = 0.01) and 0–200 ms (mean difference: 0.72 Nm∗kg−1∗s−1, 95% CI [0.09; 1.35], p = 0.027). Higher maximal hip extension strength was significantly associated with
greater ability to participate fully in preinjury sport at preinjury level (odds ratio:
17.71 95% CI [1.77; 177.60]).
Conclusions
After hip arthroscopy for FAIS subjects show limited impairments in maximal and explosive
hip muscle strength between operated and non-operated hip. Higher muscle strength
was positively associated with higher sports function and ability to participate in
sport.
Keywords
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Article info
Publication history
Published online: May 18, 2021
Accepted:
May 11,
2021
Received in revised form:
May 3,
2021
Received:
April 14,
2020
Identification
Copyright
© 2021 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
