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RESEARCH PAPERS

A Continuum Theory and an Experiment for the Ion-Induced Swelling Behavior of Articular Cartilage

[+] Author and Article Information
E. R. Myers, W. M. Lai, V. C. Mow

Department of Mechanical Engineering, Aeronautical Engineering and Mechanics, Rensselaer Polytechnic Institute, Troy, N.Y. 12181

J Biomech Eng 106(2), 151-158 (May 01, 1984) (8 pages) doi:10.1115/1.3138473 History: Received October 06, 1983; Revised November 22, 1983; Online June 15, 2009

Abstract

Swelling of normal bovine articular cartilage equilibrated in NaCl solutions was dimensionally measured in thin strips of tissue. The ion-induced strains show that free swelling of articular cartilage is anisotropic and inhomogeneous. For the molar concentrations used, contraction increased linearly with concentration, defining a “coefficient of chemical contraction” (αc ). Isometrically constrained specimens registered a rise in tensile force followed by stress relaxation. An extension of the biphasic theory incorporating this ion-induced strain is proposed. This theory can describe the equilibrium anisotropic swelling behavior of cartilage and explain the transient force history observed in the isometric experiment.

Copyright © 1984 by ASME
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