Journal of Rehabilitation Research & Development (JRRD)

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Volume 51 Number 10, 2014
   Pages 1579 — 1590

Abstract — Differentiation between solid-ankle cushioned heel and energy storage and return prosthetic foot based on step-to-step transition cost

Daphne Wezenberg, PhD;1* Andrea G. Cutti, PhD;2 Antonino Bruno, MS;2 Han Houdijk, PhD1

1Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, Amsterdam, the Netherlands; and Department of Research and Development, Heliomare, Wijk aan Zee, the Netherlands; 2Department of Research and Development, INAIL Prosthesis Centre, Vigorso di Budrio, Bologna, Italy

Abstract — Decreased push-off power by the prosthetic foot and inadequate roll-over shape of the foot have been shown to increase the energy dissipated during the step-to-step transition in human walking. The aim of this study was to determine whether energy storage and return (ESAR) feet are able to reduce the mechanical energy dissipated during the step-to-step transition. Fifteen males with a unilateral lower-limb amputation walked with their prescribed ESAR foot (Vari-Flex, Ossur; Reykjavík, Iceland) and with a solid-ankle cushioned heel foot (SACH) (1D10, Ottobock; Duderstadt, Germany), while ground reaction forces and kinematics were recorded. The positive mechanical work on the center of mass performed by the trailing prosthetic limb was larger (33%, p = 0.01) and the negative work performed by the leading intact limb was lower (13%, p = 0.04) when walking with the ESAR foot compared with the SACH foot. The reduced step-to-step transition cost coincided with a higher mechanical push-off power generated by the ESAR foot and an extended forward progression of the center of pressure under the prosthetic ESAR foot. Results can explain the proposed improvement in walking economy with this kind of energy storing and return prosthetic foot.

Key words: amputation, ankle power, center of mass mechanics, ESAR prosthetic foot, gait, lower-limb prosthesis, mechanical energy, roll-over shape, SACH prosthetic foot, walking.

View HTML ¦ View PDF ¦ Contents Vol. 51, No.10

This article and any supplementary material should be cited as follows:
Wezenberg D, Cutti AG, Bruno A, Houdijk H. Differentiation between solid-ankle cushioned heel and energy storage and return prosthetic foot based on step-to-step transition cost. J Rehabil Res Dev. 2014;51(10):1579–90.
ResearcherID/ORCID: Daphne Wezenberg, PhD: D-6143-2014; Han Houdijk, PhD: A-6364-2013

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