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Varus-Valgus motion and functional ability in patients with osteoarthritis of the knee.
  1. M van der Esch (m.vd.esch{at}janvanbreemen.nl)
  1. Jan van Breemen Institute, Netherlands
    1. M Steultjens (m.steultjens{at}vumc.nl)
    1. VU University Medical Center, Netherlands
      1. J Harlaar (j.harlaar{at}vumc.nl)
      1. VU University Medical Center, Netherlands
        1. N Wolterbeek (n.wolterbeek{at}lumc.nl)
        1. MOVE Research Institute, Netherlands
          1. D Knol (d.knol{at}vumc.nl)
          1. VU University Medical Center, Netherlands
            1. J Dekker (j.dekker{at}vumc.nl)
            1. VU University Medical Center, Netherlands

              Abstract

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

              Methods. Sixty-three patients with OA of the knee were tested. Varus-valgus motion was assessed by optoelectronic recording and 3D motion analysis. Functional ability was assessed by observation, using a 100-m walking test, a Get Up and Go test, and by the 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 (i.e. longer walking-time and GUG-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. (i) In knee OA patients 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, and (ii) knee OA patients 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.

              • disability
              • kinematics
              • knee
              • muscle strength
              • osteoarthritis

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