Abstract
Objectives
This study investigated isometric and isokinetic hip strength in individuals with
and without symptomatic femoroacetabular impingement (FAI). The specific aims were
to: (i) determine whether differences exist in isometric and isokinetic hip strength
measures between groups; (ii) compare hip strength agonist/antagonist ratios between
groups; and (iii) examine relationships between hip strength and self-reported measures
of either hip pain or function in those with FAI.
Design
Cross-sectional.
Methods
Fifteen individuals (11 males; 25 ± 5 years) with symptomatic FAI (clinical examination and imaging (alpha angle >55°
(cam FAI), and lateral centre edge angle >39° and/or positive crossover sign (combined
FAI))) and 14 age- and sex-matched disease-free controls (no morphological FAI on
magnetic resonance imaging) underwent strength testing. Maximal voluntary isometric
contraction strength of hip muscle groups and isokinetic hip internal (IR) and external
rotation (ER) strength (20°/s) were measured. Groups were compared with independent
t-tests and Mann–Whitney U tests.
Results
Participants with FAI had 20% lower isometric abduction strength than controls (p = 0.04). There were no significant differences in isometric strength for other muscle
groups or peak isokinetic ER or IR strength. The ratio of isometric, but not isokinetic,
ER/IR strength was significantly higher in the FAI group (p = 0.01). There were no differences in ratios for other muscle groups. Angle of peak
IR torque was the only feature correlated with symptoms.
Conclusions
Individuals with symptomatic FAI demonstrate isometric hip abductor muscle weakness
and strength imbalance in the hip rotators. Strength measurement, including agonist/antagonist
ratios, may be relevant for clinical management of FAI.
Keywords
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Article info
Publication history
Published online: October 13, 2015
Accepted:
October 7,
2015
Received in revised form:
September 18,
2015
Received:
June 30,
2015
Identification
Copyright
© 2015 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
