PMID: 15382807Sep 24, 2004Paper

Characterisation of prosthetic feet used in low-income countries

Prosthetics and Orthotics International
Michel SamDudley S Childress

Abstract

Eleven kinds of prosthetic feet that were designed for use in low-income countries were mechanically characterised in this study. Masses of the different kinds of prosthetic feet varied substantially. Dynamic properties, including damping ratios and resonant frequencies, were obtained from step unloading tests of the feet while interacting with masses comparable to the human body. Data showed that for walking, the feet can be appropriately modeled using their quasistatic properties since natural frequencies were high compared to walking frequencies and since damping ratios were small. Roll-over shapes, the effective rocker (cam) geometries that the feet deform to under walking loads, were determined using a quasistatic loading technique and a spatial transformation of the ground reaction force's centre of pressure. The roll-over shapes for most of the prosthetic feet studied were similar to the roll-over shape of the SACH (solid-ankle cushioned heel) prosthetic foot. All roll-over shapes showed a lack of forefoot support, which may cause a "drop-off" experience at the end of single limb stance and shorter step lengths of the contralateral limb. The roll-over shapes of prosthetic feet appear useful in characterization of foot fu...Continue Reading

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Citations

Nov 8, 2017·Journal of Neuroengineering and Rehabilitation·David J ReinkensmeyerThomas Corfman
Nov 19, 2010·Prosthetics and Orthotics International·Jan Andrysek
Oct 3, 2020·Journal of Biomechanical Engineering·Kathryn M OlesnavageAmos G Winter
Aug 13, 2011·Journal of Biomechanics·Matthew J MajorDavid Howard

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