Total Knee Replacement Polyethylene Stresses During Loading in a Knee Simulator

[+] Author and Article Information
Virginia L. Giddings, Steven M. Kurtz

Exponent, Inc., 149 Commonwealth Avenue, Menlo Park, CA 94025

Avram A. Edidin

Howmedica Osteonics Corp., 59 Route 17, Allendale, NJ 07401

J. Tribol 123(4), 842-847 (Aug 31, 2000) (6 pages) doi:10.1115/1.1330735 History: Received February 15, 2000; Revised August 31, 2000
Copyright © 2001 by ASME
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Finite element meshes of the femoral component, tibial insert, and tibial base plate
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Schematic showing boundary conditions for the Stanmore knee simulator (left). The schematic is superimposed over the photograph of the Stanmore simulator on the right.
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Schematic showing the boundary conditions applied to the finite element model. The axial force and anterior/posterior (A/P) force were applied to the center of mass of the tibial baseplate, which was modeled as a rigid body. The tibial baseplate was constrained to move only in the sagittal plane (no motion in the medial/lateral direction). The flexion/extension boundary condition was applied to the elements representing the rigid femoral component; the remaining degrees of freedom for the femoral component were fixed.
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Force and flexion angle inputs for the Stanmore knee simulator which were used in the finite element analysis
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Fringe plots of the maximum values throughout loading cycle for: von Mises stress (A), contact stress (B), and von Mises strain (C)
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Anterior-posterior displacement of tibial baseplate during finite element analysis
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Worn tibial component specimen after wear testing in a Stanmore knee simulator




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