First-Order Model for the Analysis of Stump Stresses for Below-Knee Amputees

[+] Author and Article Information
D. J. Winarski

IMB Corporation, General Products Division, Tucson, Ariz. 85744

J. R. Pearson

The University of Michigan, Ann Arbor, Mich. 48109

J Biomech Eng 112(4), 475-478 (Nov 01, 1990) (4 pages) doi:10.1115/1.2891214 History: Received March 17, 1989; Revised April 20, 1990; Online March 17, 2008


This study extends what had been a purely numerical model that used influence-factor matrices to relate the stump stresses to prosthesis loads for unilateral, below/knee amputees. Previously published influence-factor matrices are now factored into a coefficient matrix times the inverse of a stump geometry matrix. Using actual stump parameters, new information is learned about how the resistive moment of the stump balances the flexion-extension moment of the prosthesis and why certain normal stresses reach a maximum during a specific portion of the stance phase of the prosthesis.

Copyright © 1990 by The American Society of Mechanical Engineers
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