Abstract
With the goal of increasing the survivorship of the prosthesis and anticipating primary stability problems of new prosthetic implants, finite element evaluation of the micromotion, at an early stage of the development, is mandatory. This allows assessing and optimizing different designs without manufacturing prostheses. This study aimed at investigating, using finite element analysis (FEA), the difference in the prediction of the primary stability of cementless hip prostheses implanted into a <TEX>$Sawbones^{(R)}$</TEX> 4th generation, using the manufacturer's mechanical properties and using mechanical properties close to that of human bone provided by the literature (39 papers). FEA was carried out on the composite <TEX>$Sawbones^{(R)}$</TEX> implanted with a straight taper femoral stem subjected to a loading condition simulating normal walking. Our results show that micromotion increases with a reduction of the bone material properties and decreases with the augmentation of the bone material properties at the stem-bone interface. Indeed, a decrease of the cancellous Young modulus from 155MPa to 50MPa increased the average micromotion from <TEX>$29{\mu}m$</TEX> up to <TEX>$41{\mu}m$</TEX> (+42%), whereas an increase of the cancellous Young modulus from 155MPa to 1000MPa decreased the average micromotion from <TEX>$29{\mu}m$</TEX> to <TEX>$5{\mu}m$</TEX> (-83%). A decrease of cortical Young modulus from 16.7GPa to 9GPa increase the average global micromotion from <TEX>$29{\mu}m$</TEX> to <TEX>$35{\mu}m$</TEX> (+33%), whereas an increase of the cortical Young modulus from 16.7GPa to 21GPa decreased the average global micromotion from <TEX>$29{\mu}m$</TEX> to <TEX>$27{\mu}m$</TEX> (-7%). It can also be seen that the material properties of the cancellous structure had a greater influence on the micromotion than the material properties of the cortical structure. The present study shows that micromotion predicted at the stem-bone interface with material properties of the <TEX>$Sawbones^{(R)}$</TEX> 4th generation is close to that predicted with mechanical properties of human femur.
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