In order to evaluate the biomechanical behavior of some types of osteosynthesis techniques (elastic or rigid) frequently used in the femoral fractures treatment, a comparative study undertaken by Finite Element Method (FEM), is presented in this paper. FEM results are used to emphasize the biomechanical particularities that can appear in the case of some elastic osteosyntheses with: Kuntscher nail (OEK), Ender nails in secant arch (OES), Ender nails and external lock (OEF), and also in the case of rigid osteosynthesis with locked intra-medullar nail (ORZ). Evaluation criteria of the biomechanical behavior of these osteosyntheses refer to the level of compression stresses and displacements in the fracture focus. The stress state and resultant displacements, in different zones of the bone and implants were also analyzed. For comparison, the stress state and displacements were also determined for the unfracturated (normal) bone. Simulations were performed for monopodal position, corresponding to the walking sequences when one leg or the other successively realizes the ground support.
