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Kinematic and biomimetic assessment of a hydraulic ankle/foot in level ground and camber walking

Bai, X, Ewins, David, Crocombe, Andrew and Xu, Wei (2017) Kinematic and biomimetic assessment of a hydraulic ankle/foot in level ground and camber walking PLoS One, 12 (7), 0180836.

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Abstract

Improved walking comfort has been linked with better bio-mimicking of the prosthetic ankle. This study investigated if a hydraulic ankle/foot can provide enough motion in both the sagittal and frontal planes during level and camber walking and if the hydraulic ankle/foot better mimics the biological ankle moment pattern compared with a fixed ankle/foot device. Five active male unilateral trans-femoral amputees performed level ground walking at normal and fast speeds and 2.5Ê camber walking in both directions using their own prostheses fitted with an ªEchelonº hydraulic ankle/foot and an ªEspritº fixed ankle/foot. Ankle angles and the Trend Symmetry Index of the ankle moments were compared between prostheses and walking conditions. Significant differences between prostheses were found in the stance plantarflexion and dorsiflexion peaks with a greater range of motion being reached with the Echelon foot. The Echelon foot also showed significantly improved bio-mimicry of the ankle resistance moment in all walking conditions, either compared with the intact side of the same subject or with the ªnormalº mean curve from non-amputees. During camber walking, both types of ankle/foot devices showed similar changes in the frontal plane ankle angles. Results from a questionnaire showed the subjects were more satisfied with Echelon foot.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Bai, XUNSPECIFIEDUNSPECIFIED
Ewins, DavidD.Ewins@surrey.ac.ukUNSPECIFIED
Crocombe, AndrewA.Crocombe@surrey.ac.ukUNSPECIFIED
Xu, WeiW.Xu@surrey.ac.ukUNSPECIFIED
Date : 13 July 2017
Identification Number : 10.1371/journal.pone.0180836
Copyright Disclaimer : © 2017 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.
Depositing User : Melanie Hughes
Date Deposited : 25 Aug 2017 15:33
Last Modified : 25 Aug 2017 15:33
URI: http://epubs.surrey.ac.uk/id/eprint/842053

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