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A biomechanical assessment of hydraulic ankle-foot devices with and without micro-processor control during slope ambulation in trans-femoral amputees

Bai, X, Ewins, David, Crocombe, Andrew and Xu, Wei (2018) A biomechanical assessment of hydraulic ankle-foot devices with and without micro-processor control during slope ambulation in trans-femoral amputees PLoS ONE, 13 (10), 0205093.

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Abstract

Slope ambulation is a challenge for trans-femoral amputees due to relative lack of knee function. The assessment of prosthetic ankles on slopes is required for supporting prostheses design, optimisation, and selection. This study assessed two hydraulic ankle-foot devices (one of the hydraulic ankles is controlled by a micro-processor that allows real-time adjustment in ankle resistance and range of motion) used by trans-femoral amputees in ascending and descending a 5-degree slope walking against a rigid ankle-foot devices. Five experienced and active unilateral trans-femoral amputees performed ascending and descending slope tests with their own prostheses fitted with a rigid ankle-foot, a hydraulic ankle-foot without micro-processor, and a hydraulic ankle-foot with micro-processor optimised for ascending and descending slopes. Peak values in hip, knee and angle joint ankles and moments were collected and the normalcy Trend Symmetry Index of the prosthetic ankle moments (as an indication of bio-mimicry) were calculated for assessment. Particular benefits of the hydraulic ankle-foot devices were better bio-mimicry of ankle resistance moment, greater range of motion, and improved passive prosthetic knee stability according to the greater mid-stance knee flexor moment (especially in descending slope) compared to the rigid design. The micro-processor controlled device demonstrated optimised ankle angles and moments for ascending and descending slope respectively, and was found to further improve the ankle moment bio-minicry and prosthetic knee stability compared to the hydraulic device without a micro-processor .

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Bai, X
Ewins, DavidD.Ewins@surrey.ac.uk
Crocombe, AndrewA.Crocombe@surrey.ac.uk
Xu, WeiW.Xu@surrey.ac.uk
Date : 5 October 2018
DOI : 10.1371/journal.pone.0205093
Copyright Disclaimer : © 2018 Bai et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Uncontrolled Keywords : Gait, Trans-femoral amputee, Trend symmetry index, Hydraulic ankle, Micro-processor, Ascending slope, Descending slope
Depositing User : Users 8 not found.
Date Deposited : 23 Oct 2018 15:17
Last Modified : 04 Sep 2019 09:55
URI: http://epubs.surrey.ac.uk/id/eprint/845550

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