TY - JOUR

T1 - Maximal hip muscle strength and rate of torque development 6–30 months after hip arthroscopy for femoroacetabular impingement syndrome

T2 - A cross-sectional study

AU - Ishøi, Lasse

AU - Thorborg, Kristian

AU - Kemp, Joanne L.

AU - Reiman, Michael P.

AU - Hölmich, Per

N1 - Publisher Copyright: © 2021 Sports Medicine Australia

PY - 2021

Y1 - 2021

N2 - 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.

AB - 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.

KW - Groin pain

KW - Hip pain

KW - Physical impairments

KW - Rehabilitation

KW - Surgery

U2 - 10.1016/j.jsams.2021.05.006

DO - 10.1016/j.jsams.2021.05.006

M3 - Journal article

C2 - 34119398

AN - SCOPUS:85107726594

VL - 24

SP - 1110

EP - 1115

JO - Journal of Science and Medicine in Sport

JF - Journal of Science and Medicine in Sport

SN - 1440-2440

IS - 11

ER -