a prosthesis for interfacing with an internal region of a bone of a given structure and function such as a femoral head and / or neck , wherein the internal region of the bone can be an avascular necrotic region . the prosthesis comprises porous filling member for filling a cored channel provided in the internal region of the bone to provide mechanical stability which preserves the function and the structure of the bone and accommodate an ingrowth of healthy vascularized bone tissue into the internal region of the bone . also , a method for mechanically stabilizing a bone using the prosthesis .