Analytical Description of Minimum Energy Expenditure Surfaces

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

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

J. R. Pearson

The University of Michigan, Ann Arbor, Mich. 48109

J Biomech Eng 110(4), 386-391 (Nov 01, 1988) (6 pages) doi:10.1115/1.3108457 History: Received March 07, 1988; Revised June 23, 1988; Online June 12, 2009


Mechanical energy expenditure during level walking was evaluated and graphed for two unilateral, below-knee amputees over time and a range of adjustments of the flexion-extension alignment angle. The resulting mechanical energy surfaces were then least-squared fitted with an analytical function that was linear in time and quadratic in flexion-extension alignment angle. The least-squares analysis showed that there was a flexion-extension adjustment that minimized the mechanical energy expenditure and that this optimal adjustment was very close to the design point set by certified prosthetists.

Copyright © 1988 by ASME
Topics: Design , Knee
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