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Computational and Mathematical Methods in Medicine
Volume 2012 (2012), Article ID 421796, 8 pages
http://dx.doi.org/10.1155/2012/421796
Research Article

Software Tool for the Prosthetic Foot Modeling and Stiffness Optimization

1Faculty of Electrical Engineering, University of Belgrade, 11000 Belgrade, Serbia
2Aalborg University, Center for Sensory Motor Interaction, 9200 Aalborg, Denmark

Received 28 September 2011; Revised 31 December 2011; Accepted 5 January 2012

Academic Editor: Carlo Cattani

Copyright © 2012 Matija Štrbac and Dejan B. Popović. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We present the procedure for the optimization of the stiffness of the prosthetic foot. The procedure allows the selection of the elements of the foot and the materials used for the design. The procedure is based on the optimization where the cost function is the minimization of the difference between the knee joint torques of healthy walking and the walking with the transfemural prosthesis. We present a simulation environment that allows the user to interactively vary the foot geometry and track the changes in the knee torque that arise from these adjustments. The software allows the estimation of the optimal prosthetic foot elasticity and geometry. We show that altering model attributes such as the length of the elastic foot segment or its elasticity leads to significant changes in the estimated knee torque required for a given trajectory.