PMID: 8953557Dec 1, 1996Paper

A method for shape optimization of a hip prosthesis to maximize the fatigue life of the cement

Medical Engineering & Physics
H S HediaT T Elmidany

Abstract

The long term success of total joint replacement can be limited by fatigue failure of the acrylic cement and the resulting disruption of the bone-cement interface. The incidence of such problems may be diminished by reduction of the fatigue notch factor in the cement, so that stress concentrations are avoided and the fatigue crack initiation time maximized. This study describes a method for numerical shape optimization whereby the finite element method is used to determine an optimal shape for the femoral stem of a hip prosthesis in order to minimize the fatigue notch factor in the cement layer and at interfaces with the bone and stem. A two-dimensional model of the proximal end of a femur fitted with a total hip prosthesis was used which was equivalent to a simplified three-dimensional axisymmetric model. Software was developed to calculate the fatigue notch factor in the cement along the cement/stem and cement/bone interfaces and in the proximal bone. The fatigue notch factor in the cement at the cement/stem interface was then minimized using the ANSYS finite element program while constraining the fatigue notch factor at the cement/bone interface at or below its initial level and maintaining levels of stress in the proximal b...Continue Reading

References

Jan 1, 1989·Journal of Biomechanics·R Huiskes, R Boeklagen
Jan 1, 1983·Journal of Biomechanics·R Huiskes, E Y Chao

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Citations

Dec 15, 2012·Journal of the Mechanical Behavior of Biomedical Materials·Sandro GrizaTelmo R Strohaecker
Jan 13, 2015·Journal of Biomechanics·D R Sumner
Sep 10, 2010·Journal of the Mechanical Behavior of Biomedical Materials·M A L Hernandez-RodriguezGeo R Contreras-Hernandez
Feb 1, 2007·Journal of Biomedical Materials Research. Part a·Habiba BougheraraL'Hocine Yahia

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