An Analysis of the Unconfined Compression of Articular Cartilage

[+] Author and Article Information
C. G. Armstrong, 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), 165-173 (May 01, 1984) (9 pages) doi:10.1115/1.3138475 History: Received June 03, 1983; Revised November 23, 1983; Online June 15, 2009


Analytical solutions have been obtained for the internal deformation and fluid-flow fields and the externally observable creep, stress relaxation, and constant strain-rate behaviors which occur during the unconfined compression of a cylindrical specimen of a fluid-filled, porous, elastic solid, such as articular cartilage, between smooth, impermeable plates. Instantaneously, the “biphasic” continuum deforms without change in volume and behaves like an incompressible elastic solid of the same shear modulus. Radial fluid flow then allows the internal fluid pressure to equilibrate with the external environment. The equilibrium response is controlled by the Young’s modulus and Poisson’s ratio of the solid matrix.

Copyright © 1984 by ASME
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