Assessing the Relative Contributions of Active Ankle and Knee Assistance to the Walking Mechanics of Transfemoral Amputees Using a Powered Prosthesis

PloS One
Kimberly A IngrahamLevi J Hargrove

Abstract

Powered knee-ankle prostheses are capable of providing net-positive mechanical energy to amputees. Yet, there are limitless ways to deliver this energy throughout the gait cycle. It remains largely unknown how different combinations of active knee and ankle assistance affect the walking mechanics of transfemoral amputees. This study assessed the relative contributions of stance phase knee swing initiation, increasing ankle stiffness and powered plantarflexion as three unilateral transfemoral amputees walked overground at their self-selected walking speed. Five combinations of knee and ankle conditions were evaluated regarding the kinematics and kinetics of the amputated and intact legs using repeated measures analyses of variance. We found eliminating active knee swing initiation or powered plantarflexion was linked to increased compensations of the ipsilateral hip joint during the subsequent swing phase. The elimination of knee swing initiation or powered plantarflexion also led to reduced braking ground reaction forces of the amputated and intact legs, and influenced both sagittal and frontal plane loading of the intact knee joint. Gradually increasing prosthetic ankle stiffness influenced the shape of the prosthetic ankle pl...Continue Reading

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Citations

Oct 3, 2018·PM & R : the Journal of Injury, Function, and Rehabilitation·Knut LechlerKristleifur Kristjansson
Nov 7, 2019·Journal of Neuroengineering and Rehabilitation·Cristiano De MarchisSilvia Conforto
Mar 3, 2018·Sensors·Srinivas PanditDinesh Kalyanasundaram

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Methods Mentioned

BETA
amputations

Software Mentioned

Matlab
SPSS
SIPFIK
Visual3D

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