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RESEARCH PAPERS

The Effect of Conformity and Plastic Thickness on Contact Stresses in Metal-Backed Plastic Implants

[+] Author and Article Information
D. L. Bartel

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, N.Y. 14853; and Department of Biomechanics, Hospital for Special Surgery, New York, N.Y. 10021

A. H. Burstein

Department of Biomechanics, Hospital for Special Surgery, New York, N.Y. 10021

M. D. Toda, D. L. Edwards

Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, N.Y. 14853

J Biomech Eng 107(3), 193-199 (Aug 01, 1985) (7 pages) doi:10.1115/1.3138543 History: Received June 03, 1983; Revised March 13, 1985; Online June 15, 2009

Abstract

Surface damage in polyethylene components for total joint replacement is associated with large contact stresses. An elasticity solution and finite element analyses were used to determine the influence of design parameters on the stresses due to contact in metal-backed components. For nearly conforming contact surfaces, it was found that the stresses in the plastic are very sensitive to clearance, that minimum plastic thickness of 4–6 mm should be maintained for metal-backed components, and that bonding the plastic to the metal backing reduces tensile stresses in the plastic at the edge of the contact zone.

Copyright © 1985 by ASME
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