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Hip muscle weakness in patients with symptomatic femoroacetabular impingement.

Abstract：

OBJECTIVE:Femoroacetabular impingement (FAI) is a pathomechanical process, which may cause hip pain, disability and early development of hip osteoarthritis (OA) in young and active adults. Patients with FAI experience functional disability during dynamic weight-bearing activities, which could originate from weakness of the hip muscles. The objective of this study was to compare hip muscle strength between patients with symptomatic FAI and healthy controls. It was hypothesized that patients would present overall hip muscle weakness compared to controls. METHODS:A total of 22 FAI patients and 22 controls matched for gender, age, and body mass participated in the study. We evaluated isometric maximal voluntary contraction (MVC) strength of all hip muscle groups using hand-held and isokinetic dynamometry, and electromyographic (EMG) activity of the rectus femoris (RF) and tensor fasciae latae (TFL) muscles during active flexion of the hip. RESULTS:FAI patients had significantly lower MVC strength than controls for hip adduction (28%), flexion (26%), external rotation (18%) and abduction (11%). TFL EMG activity was significantly lower in FAI patients compared with controls (P=0.048), while RF EMG activity did not differ significantly between the two groups (P=0.056). CONCLUSIONS:Patients with symptomatic FAI presented muscle weakness for all hip muscle groups, except for internal rotators and extensors. Based on EMG recordings, it was demonstrated that patients with symptomatic FAI have a reduced ability to activate TFL muscle during hip flexion. These findings provide orthopedic surgeons with objective information about the amount and specificity of hip muscle weakness in patients with FAI. Future research should investigate the relationship between hip muscle weakness, functional disability and overuse injury risks, as well as the effects of hip muscle strengthening on clinical outcomes in individuals with symptomatic FAI.

journal_name

Osteoarthritis Cartilage

journal_title

Osteoarthritis and cartilage

authors

Casartelli NC,Maffiuletti NA,Item-Glatthorn JF,Staehli S,Bizzini M,Impellizzeri FM,Leunig M

doi

10.1016/j.joca.2011.04.001

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

816-21

issue

eissn

1063-4584

issn

1522-9653

pii

S1063-4584(11)00109-9

journal_volume

pub_type

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Hip muscle weakness in patients with symptomatic femoroacetabular impingement.