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RESEARCH PAPERS

Long Bone Torsion: I. Effects of Heterogeneity, Anisotropy and Geometric Irregularity

[+] Author and Article Information
J. G. Kennedy, D. R. Carter

Design Division, Mechanical Engineering Department, Stanford University, Stanford, Calif. 94305; and Rehabilitation Research and Development Center, Veterans Administration Medical Center, Palo Alto, Calif. 94304

J Biomech Eng 107(2), 183-188 (May 01, 1985) (6 pages) doi:10.1115/1.3138539 History: Received June 26, 1984; Revised December 07, 1984; Online June 15, 2009

Abstract

The influences of heterogeneity, anisotropy and geometric irregularity on the unrestrained, linearly elastic torsional response of long bones are assessed. Longitudinal geometric variations contribute insignificantly to the torsional response for typical long bone geometries. Anisotropy, heterogeneity and transverse geometric irregularity significantly influence the torsional response. A procedure is discussed which uses an approximate means to characterize both heterogeneity and anisotropy in predicting the torsional response. The accuracy of circular and elliptical annulus models of the bone cross-sectional geometry are assessed by comparing the stress predictions of these simple models to those of finite element models of the bone geometry.

Copyright © 1985 by ASME
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