Variability of a Three-Dimensional Finite Element Model Constructed Using Magnetic Resonance Images of a Knee for Joint Contact Stress Analysis

[+] Author and Article Information
Guoan Li, Orlando Lopez, Harry Rubash

Orthopedic Biomechanics Lab, Harvard Medical School, Massachusetts General Hospital/Beth Israel Deaconess Medical Center, Boston, MA 02215

J Biomech Eng 123(4), 341-346 (Mar 13, 2001) (6 pages) doi:10.1115/1.1385841 History: Received March 02, 1999; Revised March 13, 2001
Copyright © 2001 by ASME
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(a) A typical sagittal plane MR image of the knee and (b) the digitized contours of the cartilage boundaries. The curves are cartilage contours constructed using the mean values of the digitized data.
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The finite element cartilage model of the knee constructed using MR images. The femoral and tibial cartilage are modeled using three-dimensional solid bodies.
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Peak von Mises stresses predicted by the five FE models under axial tibial loads with a Young’s modulus of 5 MPa and a Poisson’s ratio of 0.45
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Variation of von Mises stress, surface pressure, and hydrostatic pressure caused by changes in material properties. (a) Young’s modulus varies with a constant Poisson’s ratio 0.45. (b) Poisson’s ratio varies with a constant Young’s modulus 5 MPa. These variations are compared with those obtained by using a Young’s modulus of 5 MPa and Poisson’s ratio of 0.45.




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