Structural design of costomized femoral prosthesis

One of the main reasons for the loosening of the prosthesis is that the standard prosthesis can not meet the individual requirements of the human body, ignoring the shape of the marrow cavity, and can not match the human marrow cavity effectively. In order to solve the problem of prosthesis loosening, this paper presents the structural design of costomized femoral prosthesis. First, the internal and external contours of the femur were extracted, and then the center line multiple sections method was used to model the handle of the femur. Then, three kinds of ball head structure models are established which are spherical, ellipsoidal and limacon spherica models. Finally, a virtual assembly of the ball head model, the prosthetic stem model and the femur was performed.