Abstract: Novel prostheses, particularly femoral prostheses, are provided. The subject devices are characterized by the presence of a curvilinear collar. Also provided are methods of implanting a prosthesis in a manner sufficient to provide for a pressure profile at the collar interface in which the pressure increases from the endosteal to the periosteal surface of the bone.

Abstract: The invention presents a method and device for increasing the fracture resistance of a bone tissue to a traumatic force. The method includes the step of selecting a nonphysiological impulse force having a location and direction resembling that of the traumatic force, but having a magnitude significantly smaller than the magnitude of the traumatic force. The impulse force is then repeatedly applied to the bone tissue, thereby stimulating the bone tissue to grow bone mass in critical areas where stresses from the traumatic force are largest. A device for applying the method includes an impulse force applicator for repeatedly applying the impulse force and a positioner for positioning the impulse force relative to the bone tissue.