A method for providing stabilization and compression of a bone fracture, the method comprising:providing an intramedullary prosthesis sized for insertion into the intramedullary canal of a bone and having a distal end, a proximal end and a porous structure therebetween, wherein (i) in a first state, the prosthesis is longitudinally expanded and radially contracted, and (ii) in a second state, the prosthesis is longitudinally contracted and radially expanded, conforms to the shape of the adjacent bone and exerts forces on the adjacent bone； andpositioning the intramedullary prosthesis within the intramedullary canal of a bone so that the intramedullary prosthesis spans the bone fracture, whereby to provide stabilization and compression of the bone fracture.
