Energy flow analysis of amputee walking shows a proximally-directed transfer of energy in intact limbs, compared to a distally-directed transfer in prosthetic limbs at push-off

Weinert-Aplin, RA, Howard, D, Twiste, M, Jarvis, HL, Bennett, A.N. and Baker, RJ 2016, 'Energy flow analysis of amputee walking shows a proximally-directed transfer of energy in intact limbs, compared to a distally-directed transfer in prosthetic limbs at push-off' , Medical Engineering & Physics .

[img] PDF - Accepted Version
Restricted to Repository staff only until 8 November 2017.

Download (1MB) | Request a copy

Abstract

Reduced capacity and increased metabolic cost of walking occurs in amputees, despite advances in prosthetic componentry. Joint powers can quantify deficiencies in prosthetic gait, but do not reveal how energy is exchanged between limb segments. This study aimed to quantify these energy exchanges during amputee walking. Optical motion and forceplate data collected during walking at a self-selected speed for cohorts of 10 controls, 10 unilateral trans-tibial, 10 unilateral trans-femoral and 10 bilateral trans-femoral amputees were used to determine the energy exchanges between lower limb segments. At push-off, consistent thigh and shank segment powers were observed between amputee groups (1.12W/kg vs. 1.05W/kg for intact limbs and 0.97W/kg vs. 0.99W/kg for prosthetic limbs), and reduced prosthetic ankle power, particularly in trans-femoral amputees (3.12W/kg vs. 0.87W/kg). Proximally-directed energy exchange was observed in the intact limbs of amputees and controls, while prosthetic limbs displayed distally-directed energy exchanges at the knee and hip. This study used energy flow analysis to show a reversal in the direction in which energy is exchanged between prosthetic limb segments at push-off. This reversal was required to provide sufficient energy to propel the limb segments and is likely a direct result of the lack of push-off power at the prosthetic ankle, particularly in trans-femoral amputees, and leads to their increased metabolic cost of walking.

Item Type: Article
Additional Information: Source data available at: https://dx.doi.org/10.17866/rd.salford.2082871.v1.
Schools: Schools > School of Health Sciences > Centre for Health Sciences Research
Journal or Publication Title: Medical Engineering & Physics
Publisher: Elsevier
ISSN: 1350-4533
Related URLs:
Funders: Engineering and Physical Sciences Research Council (EPSRC), Royal Centre for Defence Medicine
Depositing User: Prof Richard Baker
Date Deposited: 14 Nov 2016 11:34
Last Modified: 08 Aug 2017 17:03
URI: http://usir.salford.ac.uk/id/eprint/40766

Actions (login required)

Edit record (repository staff only) Edit record (repository staff only)

Downloads

Downloads per month over past year