Numerical simulation of the proximal femur could provide an effective approach to predict the femoral fracture risk. However, most of the extant numerical simulations are static simulations, which cannot accurately reflect the dynamic growth process of cracks. In this study, the dynamic simulation by incremental element deletion (IED) based finite element analysis (FEA) was developed on femur fracture analysis and compared with two widly-used approaches (XFEM and USDFLD). It was also evaluated using the in-vitro loading test. Moreover, the effects of different impact speeds, fall postures, and cortical thicknesses on fracture types and mechanical responses were investigated. Impact speeds cause different crack propagation behaviors of the femoral neck. Falling forward was less likely to cause proximal femoral fracture compared with falling backward. The model with thin cortical bone was prone to fracture. These provides a theoretical basis and method for predicting femoral fracture risk in the elderly.