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Mediolateral angular momentum changes in persons with amputation during perturbed walking.

Riley C Sheehan1, Eduardo J Beltran2, Jonathan B Dingwell3

  • 1Department of Kinesiology & Health Education, University of Texas, Austin, TX 78712, USA; Military Performance Lab, Department of Orthopaedics and Rehabilitation, San Antonio Military Medical Center, Ft. Sam Houston, TX 78234, USA.

Gait & Posture
|March 24, 2015
PubMed
Summary
This summary is machine-generated.

Individuals with lower limb amputation experience greater instability during walking perturbations. They rely more on their intact limb to maintain balance, highlighting a key difference in stability control compared to able-bodied individuals.

Keywords:
GaitStabilityTranstibial amputationVariabilityVirtual reality

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Area of Science:

  • Biomechanics
  • Prosthetics and Orthotics
  • Rehabilitation Engineering

Background:

  • Over 50% of individuals with lower limb amputation fall annually.
  • Reduced ability to respond to frontal plane stability challenges is common.
  • Angular momentum range correlates with stability and fall risk.

Purpose of the Study:

  • To investigate how lateral walking surface perturbations affect angular momentum regulation.
  • To compare able-bodied controls and individuals with unilateral transtibial amputation.
  • To analyze whole body and individual leg angular momentum during perturbed walking.

Main Methods:

  • Participants walked in a Computer Assisted Rehabilitation Environment.
  • Mediolateral platform oscillations simulated walking surface perturbations.
  • Whole body and leg angular momentum were measured with and without perturbations.

Main Results:

  • Perturbations significantly increased angular momentum range and variability for all participants.
  • No group differences in whole body angular momentum during unperturbed walking.
  • Individuals with amputation showed greater frontal plane angular momentum and were more affected by perturbations.

Conclusions:

  • Individuals with transtibial amputation are more destabilized by walking surface perturbations.
  • They predominantly use altered motion of the intact limb for mediolateral stability.
  • Altered prosthetic leg motion may contribute to reduced stability during perturbations.