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Effects of Joint Congruency on the Response of a Tension-Compression Nonlinear Constitutive Model for Cartilage

[+] Author Affiliations
Benjamin J. Ellis, Andrew E. Anderson, Steve A. Maas, Jeffrey A. Weiss

University of Utah, Salt Lake City, UT

Gerard A. Ateshian, Clare Canal

Columbia University, New York, NY

Paper No. SBC2008-192897, pp. 1073-1074; 2 pages
doi:10.1115/SBC2008-192897
From:
  • ASME 2008 Summer Bioengineering Conference
  • ASME 2008 Summer Bioengineering Conference, Parts A and B
  • Marco Island, Florida, USA, June 25–29, 2008
  • Conference Sponsors: Bioengineering Division
  • ISBN: 978-0-7918-4321-5
  • Copyright © 2008 by ASME

abstract

Articular cartilage exhibits inhomogeneous, rate-dependent and tension-compression (TC) nonlinear material properties. It is a biphasic material (solid and fluid phases) and its solid phase is stiffer in tension than compression [1]. Despite this complex material behavior, elastic, incompressible material models can be used to predict the short-time loading response of cartilage [2]. To our knowledge, the use of an anisotropic incompressible material to represent cartilage in a finite element (FE) joint model has not been investigated and thus the importance of the TC nonlinearity in the analysis of 3D articular contact models is limited [3]. We have been investigating a TC nonlinear incompressible constitutive model to represent hip cartilage. The objective of this study was to assess the influence of TC nonlinearity on FE predictions of stress and strain as a function of congruency between two spherical cartilage layers. It was hypothesized that the TC nonlinear and neo-Hookean constitutive models would yield a similar response when the cartilage layers were nearly congruent, but as the congruency of the cartilage layers decreased the predicted response from the two materials would be different.

Copyright © 2008 by ASME

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