The purpose of this paper is to present a new method of a femur part modeling using the finite element method. This method treats a femur part as a system composed of cortical and trabecular bones. For the purpose of determining a proper shape of a femur part model there were created three models: a) the first one describes a femur part as a solid structure; b) the second one describes a femur part as a connection of cortical bone shell and trabecular bone modeled as a shell bar-connector scaffold; c) the third one describes a femur part as a connection of cortical bone shell and trabecular bone modeled as a solid bar-connector scaffold.