Sex Differences in Hip Muscle Strength in Patients with Femoroacetabular Impingement Syndrome
Di Stasi, Stephanie
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Series/Report no.:2016 Richard J. and Martha D. Denman Undergraduate Research Forum. 21st
Femoroacetabular impingement (FAI) is a debilitating musculoskeletal condition that can cause hip pain and weakness, functional disability, and eventually osteoarthritis. Women with FAI have demonstrated poorer function both pre and postoperatively; however, it is unclear what impairments may have contributed to these discrepancies. The purpose of this study was to investigate sex differences in hip strength for persons who have undergone hip arthroscopy for symptomatic FAI. We tested the hypothesis that (1) women would have significantly lower hip strength after surgery and (2) the involved limb would be weaker than the uninvolved limb, regardless of sex. Twenty-five active individuals (age: 25.2±11.2y; 13 women; BMI: 24.8±4.2kg/m2) underwent bilateral hip strength testing six months after hip arthroscopy. Demographic information and isometric hip strength data were collected. Side-lying hip abduction and external rotation strength were measured during maximum isometric voluntary contractions with a custom strength measurement device. Strength was normalized to body mass, then limb averages were calculated. A two-way ANOVA with post-hoc t-tests were performed to investigate sex and limb differences in normalized strength (P<0.05). There was no significant interaction of limb by sex (P=0.30) or significant effect of limb (P=0.347); however, there was a significant main effect of sex (P≤0.03) for hip abduction and external rotation strength. Women demonstrated significantly lower normalized strength for both hip abduction and external rotation (P<0.002). Our study supports our hypothesis that women have significantly lower hip strength than men after surgery. Surprisingly, strength deficits of the involved limb compared to the uninvolved limb were not identified in this cohort. This could be a limitation of the methods used to assess muscle strength or the inclusion of only two major hip muscle groups. Gaining a greater understanding of potential sex differences in strength will better equip clinicians to provide treatment to prevent functional deficits.
Health Professions - Clinical: 1st Place (The Ohio State University Denman Undergraduate Research Forum)
Academic Major: Exercise Science Education
The project described was supported in part/full by the Legacy Fund of the Sports Physical Therapy Section of the American Physical Therapy Association
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