Reduction of Lower Limb Model Indeterminacy by Force Redundancy in Sit-to-Stand Motion

Kit Yi Mak, Oron Levin, Joseph Mizrahi, Christina W.Y. Hui-Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)

Abstract

Calculation of joint torques during the rising phase of sit-to-stand motion is in most cases indeterminate, due to the unknown thighs/chair reaction forces in addition to the other sources of uncertainties such as joint positioning and anthropometric data. In the present study we tested the reliability of computation of the joint torques from a five-segment model; we used force plate data of thighs/chair and feet/ground reaction forces, in addition to kinematic measurements. While solving for joint torques before and after seat-off, differences between model solutions and measured data were calculated and minimized using an iterative algorithm for the reestimation of joint positioning and anthropometric properties. The above method was demonstrated for a group of six normal elderly persons.
Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalJournal of Applied Biomechanics
Volume20
Issue number1
DOIs
Publication statusPublished - 1 Jan 2004

Keywords

  • Chair-rise
  • Inverse dynamics
  • Joint torques
  • Lower extremities
  • Model uncertainties

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Rehabilitation

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