The application of bone surface remodeling simulation in optimization of artificial femur prosthesis

One of the primary problems exits in the technology of implanting artificial femur is: There are syndromes such as long-term loosing, which cause the operation failure. It is general considered that the main reason of the loosing is bone absorption caused by abrasion fragments and the effect of stress shielding. So it is no doubt that optimizing the structure of artificial femur is very important. Based on bone remodeling theory and finite element method, computer simulation was used to bone remodeling behavior after artificial femur prosthesis embedding. Computer according with section absorptive rate and losing ratio of bending resistance section module also did quantitative analysis of the effect of stress shielding brought by prosthesis. During the simulation and analysis, surface-remodeling theory with strain energy density as controlling variation was taken as bone remodeling theory, and 20-node isoparametric element was used as finite element. The results have shown that among all prosthesis model discussed in this paper, there is only 4 percent discrepancy of absorption among the three collar type prostheses and 30 percent for the three straight handle type ones with different length. The length variation of straight handle has distinct influence on the effect of stress shielding.