Asymmetric leg loading during sit-to-stand, walking and quiet standing in patients after unilateral total hip replacement surgery

V. L. Talis, A. A. Grishin, I. A. Solopova, T. L. Oskanyan, V. E. Belenky, Y. P. Ivanenko

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Asymmetric limb loading persists well after unilateral total hip replacement surgery and represents a risk of the development of osteoarthritis in the non-operated leg. Here we studied bilateral limb loading in hip arthroplasty patients for a variety of everyday activities. Methods: Twenty-seven patients and 27 healthy age-matched control subjects participated in the study. They were asked to stand up from a chair, to stand quietly, to perform isometric maximal voluntary contractions and to walk along a 10 m path at a natural and fast speed. Two force platforms measured vertical forces under each foot during quiet standing and sit-to-stand maneuver. Temporal variables of gait were measured using footswitches. Findings: In all tasks patients tended to preferentially load the non-operated limb, though the amount of asymmetry depended on the task being most prominent during standing up (inter-limb weight bearing difference exceeded 20%, independent of speed or visual conditions). In contrast, when performing maximal voluntary contractions, or during walking and quiet standing, the inter-limb difference in the maximal force production, stance/swing phase durations or weight bearing was typically less than 10%. Interpretation: The results suggest that the amount of asymmetry might not be necessarily the same for different tasks. Asymmetric leg loading in patients can be critical during sit-to-stand maneuver in comparison with quiet standing and walking, and visual information seems to play only a minor role in the control of the weight-bearing ability. The proposed asymmetry indices might be clinically significant for development of post-surgical rehabilitation.

Original languageEnglish
Pages (from-to)424-433
Number of pages10
JournalClinical Biomechanics
Volume23
Issue number4
DOIs
Publication statusPublished - May 2008

Keywords

  • Asymmetry
  • Hip arthroplasty
  • Humans
  • Loading
  • Locomotion
  • Posture
  • Sit-to-stand

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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