Interactions between foot placement, trunk frontal position, weight-bearing and knee moment asymmetry at seat-off during rising from a chair in healthy controls and persons with hemiparesis

J Rehabil Med. 2008 Mar;40(3):200-7. doi: 10.2340/16501977-0155.

Abstract

Objective: To assess the interaction of foot placement, trunk frontal position, weight-bearing and knee moment asymmetry at seat-off when rising from a chair.

Design: Cross-sectional study.

Subjects: Seventeen subjects with hemiparesis and 15 healthy controls.

Methods: Trunk position, weight-bearing and knee moment asymmetry were quantified by kinetic and kinematic analysis when the subjects rose from a chair using 3 different foot placements: spontaneous, symmetrical and asymmetrical. Asymmetry was defined by the ratio between sides.

Results: In the healthy controls, the spontaneous and symmetrical foot placements were associated with an almost vertical trunk position and a symmetrical weight-bearing and knee moment. The asymmetrical foot placement resulted in a trunk displacement towards the foot placed behind, with more weight-bearing and higher moment on this side. The opposite was observed in the hemiparetic participants where the spontaneous and symmetrical foot conditions determined a trunk position and an asymmetry bias towards the unaffected side. Placing the affected foot behind the other reduced the asymmetrical behaviour.

Conclusion: Changes in weight-bearing are partly associated with the frontal trunk position, and foot placement manipulations can be used to modify weight-bearing distribution. Inference on weight-bearing is possible by observing the trunk position during the sit-to-stand task in persons with hemiparesis.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Cross-Sectional Studies
  • Female
  • Foot
  • Hemiplegia / physiopathology
  • Hemiplegia / rehabilitation*
  • Humans
  • Knee
  • Male
  • Middle Aged
  • Movement / physiology*
  • Posture / physiology*
  • Stroke / physiopathology
  • Stroke Rehabilitation*
  • Weight-Bearing / physiology