An Experimental Simulation Using 3-D Axisymmetric Model of an Artificial Hip Joint

SK Senapati, S Pal


The quality and accuracy of results obtained from Finite Element Analysis of othopaedic biomechanics problems depend on the quality of representation of finite element model as compared to actual conditions. The accurate estimation of various biological parameters required for modeling and analysis is very difficult because of all biological activities are complex in nature. Sometimes, for simplification of the analysis, the complex nature of it is partially ignored and these contribute some errors in the results. In the present analysis, a simplified axisymmetric model resembling an artificial cemented hip joint was considered. A central solid cylindrical stem was to be rigidly fixed with an external hollow wooden cylinder by means of acrylic bone cement (PMMA). Strain gauges were put on the surface of the stem at desired location to measure strain under different loading condition. The material properties, loading and constraint conditions were most closely simulated in the FE model. The result of strains calculated from finite element analysis and measured from experiments for different loading cases were found to have excellent match with little or no deviation except a few mismatches. Society for Biomaterials and Artificial Organs (India), 20090515-44.

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