Abstract: This study aimed to implement the Finite Element (FE) method to analyze and investigate the stress distribution effects of broken fibula on lower extremity under the body weight and moment. The congruent three-Dimensional (3D) solid models of lower extremity bones (tibia and fibula) were generated using the Computerized Tomography (CT) images. After modeling processes, 3D model was converted to FE model to apply the loading and the relevant boundary conditions to obtain the stress distribution on the tibial zone. It was obtained that the fibula had an important stress distribution role on tibia. Especially, according the all FE analysis fibula is an effective duty of load carrying capacity on distal side of tibia. These FEA suggested that the loading characteristics of the fibula should be taken into account in planning medical and surgical operations.