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Varus-valgus motion and functional ability in patients with knee osteoarthritis.

Abstract

OBJECTIVE

To assess the relationship between knee varus-valgus motion and functional ability, and the impact of knee varus-valgus motion on the relationship between muscle strength and functional ability in patients with osteoarthritis (OA) of the knee.

METHODS

Sixty-three patients with knee OA were tested. Varus-valgus motion was assessed by optoelectronic recording and three-dimensional motion analysis. Functional ability was assessed by observation, using a 100 m walking test, a Get Up and Go test, and WOMAC questionnaire. Muscle strength was measured by a computer-driven isokinetic dynamometer. Regression analyses were performed to assess the relationships between varus-valgus motion and functional ability, and to assess the impact of varus-valgus motion on the relationship between muscle strength and functional ability.

RESULTS

In patients with high varus-valgus range of motion, muscle weakness was associated with a stronger reduction in functional ability (ie, longer walking time and Get Up and Go time) than in patients with low varus-valgus range of motion. A pronounced varus position and a difference between the left and right knees in varus-valgus position were related with reduced functional ability.

CONCLUSIONS

In patients with knee OA with high varus-valgus range of motion, muscle weakness has a stronger impact on functional ability than in patients with low varus-valgus range of motion. Patients with knee OA with more pronounced varus knees during walking show a stronger reduction in functional ability than patients with less pronounced varus knees or with valgus knees.

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  • Authors

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    Source

    Annals of the rheumatic diseases 67:4 2008 Apr pg 471-7

    MeSH

    Aged
    Disability Evaluation
    Female
    Gait
    Humans
    Knee Joint
    Male
    Middle Aged
    Muscle Strength
    Muscle Weakness
    Muscle, Skeletal
    Osteoarthritis, Knee
    Range of Motion, Articular
    Severity of Illness Index
    Walking
    Weight-Bearing

    Pub Type(s)

    Journal Article

    Language

    eng

    PubMed ID

    17604283