Finite element stress analysis of the femur with implant utilizing computed tomography

Document Type

Article

Publication Date

6-30-1997

Abstract

Three 3-D finite element models (FEM) of a femur together with the hip prosthesis were developed using the computer aided design (CAD) program ANSYS and computed tomography (CT). Finite element stress analysis (FEA) on the FEM of three different femora with various types hip prosthesis such as cobalt- chromium alloy, titanium alloy, cemented, and porous-coated were conducted. A total of 1264 3-D solid elements, and 1371 nodal points were used. All prosthetic materials used in the FEM were assumed to be linear, homogeneous, and isotropic. Simulation results revealed that the cobalt-chromium alloy prosthesis has a peak stress of 12% of the fatigue limit; and it unloads the calcar cortical bone stress. The titanium alloy prosthesis has a peak stress of 4% of the fatigue limit; and it decreases the stress within the prosthetic stem except at the proximal side. When comparing the porous coated prosthesis with the cemented one, the porous coated prosthesis decreases bone stresses and bone/prosthesis interface stress. In addition, the porous coated prosthesis has a more uniformly distributed stress in the bone tissue than cemented one. Decreasing the elastic modulus and the poisson's ratio of the porous coated layer decreases the interface stress between cancellous bone and the porous coating layer. Bone hypertrophy around the distal end of the prosthesis decreases the stress (up to 35%) in the distal prosthetic stem and the femoral surface.

Identifier

0031080404 (Scopus)

Publication Title

Biomedical Engineering Applications Basis and Communications

ISSN

10162372

First Page

36

Last Page

40

Issue

1

Volume

9

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