The purpose of this study was to compare load carrying capacity and stress distributions of broken fibula on lower extremity under the average body weight and moment using with three-dimensional finite element analysis (FEA). The finite element (FE) models were generated from patient's computed tomography (CT) data images. The loading and the relevant boundary conditions selected according to average human body conditions for obtaining the stress distribution on tibia surface. According the all FE analysis fibula is an effective role for load carrying capacity on distal side of tibia. These FEA results showed that the loading characteristics of the fibula should be taken into account in planning medical and surgical operations.