DOS 2016

DOS Kongressen 2016 ·

133

Is muscle strength impairments different for male vs.

female patients with symptomatic femoroacetabular

impingement?

Signe Kierkegaard, Ulrik Dalgas, Bent Lund, Kjeld Søballe, Inger Mechlenburg

Department of Orthopaedic Surgery, Horsens Hospital; Section for Sport

Science, Department of Public Health, Aarhus University; Department of

Orthopaedic Surgery, Horsens Hospital; Department of Orthopaedic Surgery,

Aarhus University Hospital; Department of Orthopaedic Surgery, Aarhus

University Hospital

Background:

Clinical and disease specific characteristics for symptomatic fem-

oroacetabular impingement (FAI) may be gender specific. Some studies report

muscle weakness in patients with FAI while other studies do not, which may be

explained by gender specific impairments.

Purpose / Aim of Study:

We aimed to investigate gender differences in maxi-

mal hip flexion and extension strength when compared to a matched healthy

reference group.

Materials and Methods:

60 patients (36 ±9years, 38 females) scheduled for

arthroscopic hip surgery for FAI and 30 age and gender matched reference per-

sons were included in the study. Participants had their maximal hip flexion and

extension strength tested using dynamometry. All participants completed two

submaximal familiarization trials followed by 3–4 maximum voluntary contrac-

tion trials. Tests were performed isometrically at 45° of hip flexion, concentric

at 60°/s and eccentric at -60 °/s. Maximal peak torque divided by body mass

was the main outcome. Comparisons between genders and patients vs. ref-

erence persons were performed with multiple regression analysis. The level of

significance was set to < 0.05.

Findings / Results:

The affected leg of the patients was significantly weaker

than the leg of references persons for all testing conditions (75-91% of refer-

ence leg). When analyzing males and females separately, this relationship was

only found in the female patients (females: 64-92% of reference vs. males:

98-113% of reference).

Conclusions:

These data suggest that, muscle strength of the affected leg of

female FAI patients is significantly weaker than reference persons, as opposed to

male FAI patients. Further studies should investigate these relationships in larger

samples and also relate findings to radiographic parameters.

No conflicts of interest reported

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