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J Sport Rehabil. 2009 Feb;18(1):104-17.

Relationships between knee valgus, hip-muscle strength, and hip-muscle recruitment during a single-limb step-down.

Author information

1
Program in Physical Therapy, Mayo Clinic, Rochester, MN 55905, USA.

Abstract

CONTEXT:

Reduced strength and activation of hip muscles might correlate with increased weight-bearing knee valgus.

OBJECTIVE:

To describe relationships among frontal-plane hip and knee angles, hip-muscle strength, and electromyographic (EMG) recruitment in women during a step-down.

DESIGN:

Exploratory study.

SETTING:

Laboratory.

PARTICIPANTS:

20 healthy women 20 to 30 years of age.

INTERVENTIONS:

Frontal-plane hip and knee angles were measured. Gluteus maximus and medius recruitment were examined with surface EMG. Hip-abduction and -external-rotation strength were quantified with handheld dynamometry.

MAIN OUTCOME MEASUREMENTS:

The authors analyzed correlation coefficients between knee and hip angles, gluteus maximus and medius EMG, and hip-abduction and -external-rotation strength.

RESULTS:

Hip-adduction angles (r = .755, P = .001), gluteus maximus EMG (r = -.451, P = .026), and hip-abduction strength (r = .455, P = .022) correlated with frontal-plane projections of knee valgus.

CONCLUSIONS:

Gluteus maximus recruitment might have greater association with reduced knee valgus in women than does external-rotation strength during step-down tasks. Gluteus medius strength might be associated with increased knee valgus.

PMID:
19321910
[Indexed for MEDLINE]

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