Sensitivity of biomechanical outcomes to independent variations of hindfoot and forefoot stiffness in foot prostheses

Human Movement Science
Peter G AdamczykMichael E Hahn

Abstract

Many studies have reported the effects of different foot prostheses on gait, but most results cannot be generalized because the prostheses' properties are seldom reported. We varied hindfoot and forefoot stiffness in an experimental foot prosthesis, in increments of 15N/mm, and tested the parametric effects of these variations on treadmill walking in unilateral transtibial amputees, at speeds from 0.7 to 1.5m/s. We computed outcomes such as prosthesis energy return, center of mass (COM) mechanics, ground reaction forces, and joint mechanics, and computed their sensitivity to component stiffness. A stiffer hindfoot led to reduced prosthesis energy return, increased ground reaction force (GRF) loading rate, and greater stance-phase knee flexion and knee extensor moment. A stiffer forefoot resulted in reduced prosthetic-side ankle push-off and COM push-off work, and increased knee extension and knee flexor moment in late stance. The sensitivity parameters obtained from these tests may be useful in clinical prescription and further research into compensatory mechanisms of joint function.

Citations

Sep 7, 2018·Bioinspiration & Biomimetics·Eric C HonertKarl E Zelik
Jan 29, 2019·Prosthetics and Orthotics International·Nicholas D WomacGlenn K Klute
Nov 23, 2019·Journal of Neuroengineering and Rehabilitation·Erica A HedrickKota Z Takahashi
Nov 10, 2018·Journal of Neuroengineering and Rehabilitation·Max K ShepherdElliott J Rouse
Oct 2, 2020·Scientific Reports·Max K Shepherd, Elliott J Rouse
Oct 3, 2020·Journal of Biomechanical Engineering·Kathryn M OlesnavageAmos G Winter
Mar 29, 2020·Human Movement Science·Eric C HonertKarl E Zelik
Apr 27, 2021·Journal of Biomechanics·Christophe LecomteSigurður Brynjolfsson
Sep 11, 2021·Journal of Biomechanical Engineering·Harrison L BartlettBrian E Lawson
Oct 26, 2021·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Lorenzo CavallaroLorenzo De Michieli

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