The excellent results obtained in the stabilization of lateral and subtrochanteric fractures of the neck of the femur by the use of Ender nails have encouraged us to extend this method, with some technical modifications, to shaft fractures of the femur. It is proposed to be an alternative in the surgical treatment of such fractures. We propose to use this alternative when local conditions counterindicate, or the risk factor in other surgical techniques is too high. This method is simple, easily executed and assures a rapid and functional recovery. Ender intramedullary nailing achieves a dynamic stabilization controlled by the elasticity of the nails, muscle tone and weight bearing. The stabilization allows slight interfragmentary movements and produces the formation of periosteal bone callus.