Structural Evaluation of Ceramic Femoral Heads: Effect of Taper Friction, Support Conditions and Trunnion Compliance

[+] Author and Article Information
E. Dragoni

Department of Mechanics, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy

A. O. Andrisano

University of Modena, Via Campi 213/B, 41100 Modena, Italy

J Biomech Eng 117(3), 293-299 (Aug 01, 1995) (7 pages) doi:10.1115/1.2794184 History: Received July 23, 1993; Revised July 30, 1994; Online October 30, 2007


The outcome of a nonlinear finite element stress analysis of ceramic heads for artificial hip joints is presented. The analysis mainly covers the influence of taper friction, support conditions and trunnion modulus of elasticity on the hoop stress distribution at the surface of the head bore. The paper quantifies how much the maximum tensile stress decreases with increasing frictional coefficient, with stiffening of the support and with stiffening of the trunnion material. An appreciable rise of the maximum tensile upon unloading of the head is also shown for the case of cup support. The computational results are found in close correspondence with photoelastic measurements of taper pressures and encourage the use, for preliminary design purposes, of an approximate theoretical model retrieved from the literature.

Copyright © 1995 by The American Society of Mechanical Engineers
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