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RESEARCH PAPERS

A Parametric Study of Acetabular Cup Design Variables Using Finite Element Analysis and Statistical Design of Experiments

[+] Author and Article Information
S. C. Mantell

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455

H. Chanda

Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, and Orthopædic Biomechanics Laboratory, Midwest Orthopædic Research Foundation, Minneapolis Medical Research Foundation, Hennepin County Medical Center, Minneapolis, MN 55404

J. E. Bechtold, R. F. Kyle

Orthopædic Biomechanics Laboratory, Midwest Orthopædic Research Foundation, of the Minneapolis Medical Research Foundation, at Hennepin County Medical Center, Minneapolis, MN 55404

J Biomech Eng 120(5), 667-675 (Oct 01, 1998) (9 pages) doi:10.1115/1.2834760 History: Received January 10, 1997; Revised January 28, 1998; Online January 23, 2008

Abstract

To isolate the primary variables influencing acetabular cup and interface stresses, we performed an evaluation of cup loading and cup support variables, using a Statistical Design of Experiments (SDOE) approach. We developed three-dimensional finite element (FEM) models of the pelvis and adjacent bone. Cup support variables included fixation mechanism (cemented or noncemented), amount of bone support, and presence of metal backing. Cup loading variables included head size and cup thickness, cup/head friction, and conformity between the cup and head. Interaction between and among variables was determined using SDOE techniques. Of the variables tested, conformity, head size, and backing emerged as significant influences on stresses. Since initially nonconforming surfaces would be expected to wear into conforming surfaces, conformity is not expected to be a clinically significant variable. This indicates that head size should be tightly toleranced during manufacturing, and that small changes in head size can have a disproportionate influence on the stress environment. In addition, attention should be paid to the use of nonmetal backed cups, in limiting cup/bone interface stresses. No combination of secondary variables could compensate for, or override the effect of, the primary variables. Based on the results using the SDOE approach, adaptive FEM models simulating the wear process may be able to limit their parameters to head size and cup backing.

Copyright © 1998 by The American Society of Mechanical Engineers
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