An order-made femoral prosthesis stem made from FRP, of which mechanical properties could be designed, is proposed as an alternative to traditional metal stem which is too stiff compared with human femur. The strength of the stem must be assured. The purpose of this study is to develop an evaluation method of strength for order-made FRP stem by using FEM. FRP stem has been manufactured and mechanical tests have been proceed. FE analyses based on damage mechanics has been carried out. As the results of tests and analyses have a good agreement, it can be demonstrated that the evaluation method by FEM is reasonable.
