US Patent 9433448 Nail-based compliant hip fixation system

System, including methods, devices, and kits, for hip fixation. The system may comprise an intramedullary nail configured to be placed longitudinally into a proximal femur. The system also may comprise a fixation element configured to be placed transversely through the nail, such that the fixation element is slideable along its long axis in the nail and extends out of the nail to a head of the proximal femur and is anchored in the head. A compliant member may be located in the nail and configured to deform reversibly in response to a load applied to the head of the proximal femur after placement of the fixation element, to reversibly change an angular orientation of the fixation element with respect to the nail.