Inhomogeneous Cartilage Properties Enhance Superficial Interstitial Fluid Support and Frictional Properties, But Do Not Provide a Homogeneous State of Stress

[+] Author and Article Information
Ramaswamy Krishnan, Seonghun Park, Gerard A. Ateshian

Department of Mechanical Engineering, Columbia University, New York, NY 10027

Felix Eckstein

Institute of Anatomy, Ludwig Maximilians Universität, Munich, Germany

J Biomech Eng 125(5), 569-577 (Oct 09, 2003) (9 pages) doi:10.1115/1.1610018 History: Received October 23, 2002; Revised April 19, 2003; Online October 09, 2003
Copyright © 2003 by ASME
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Contact geometry and finite-element mesh in the deformed configuration. The mesh deformation has been scaled up for emphasis in this figure.
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Total traction and interstitial fluid pressure at the contact interface between the cylindrical indenter and articular layer, at t=1 s. Results are shown on the left for the homogeneous models and on the right for the inhomogeneous models. (a) Patellar contact. (b) Femoral contact.
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The interstitial fluid pressure field throughout the cartilage layer, at t=1 s. Results are presented as a contour map together with vector arrows indicating the magnitude and direction of relative fluid flux, for the representative case of the patellar layer with (a) inhomogeneous and (b) homogeneous properties. The mesh deformation is shown to scale.
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(a,b) Maximum principal normal strain distribution in the articular layer, at t=1 s, for the inhomogeneous and homogeneous finite-element models of the patella, respectively; (c,d) maximum principal normal effective stress; (e,f ) minimum principal normal effective stress; (g,h) strain-energy density distribution. The mesh deformation is shown to scale.




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