Implant separation from bone tissue, resulting in the necessity for revision surgery, is a serious drawback of cementless total joint replacement. Unnatural stress distribution around the implant is considered the main reason for the failure. Optimization of the implant properties, especially its geometric parameters, is believed to be the right way to improve reliability of joint prosthetics. An efficient numerical model of the femur–implant system is presented in the paper, including the finite element formulation featuring computation of sensitivity gradients, parametric mesh generator, and a gradient-based optimization scheme. Numerical examples show results of shape optimization of an implant for two sets of design parameters and for the initial stability criterion taken as the optimization goal. The optimum shape appears to be relatively long and proximally porous-coated on about half of its length. The method can be flexibly adjusted to various implant types, stress- and displacement-based optimum criteria, and geometric design parameters.
Design Optimization of Cementless Femoral Hip Prostheses Using Finite Element Analysis
Contributed by the Bioengineering Division for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received by the Bioengineering Division February 13, 2000; revised manuscript received April 17, 2001. Associate Editor: C. H. Turner.
Kowalczyk, P. (April 17, 2001). "Design Optimization of Cementless Femoral Hip Prostheses Using Finite Element Analysis ." ASME. J Biomech Eng. October 2001; 123(5): 396–402. https://doi.org/10.1115/1.1392311
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