Abstract
We present a new design for a hip prosthesis using polyethylene-hydroxyapatite, a composite material with layered stiffness and good bone compatibility. In order to overcome the low stiffness of the matrix, carbon fibre reinforcement is suggested. This new collarless prosthesis was designed to give maximum stiffness at the core and lower stiffness at the bone-implant interface. For this design a 2D finite element analysis was undertaken; its results were compared with those for a titanium alloy prosthesis. The effect of the variation in the collar stiffness was also analysed.
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