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Clinical photograph of hollow-bone-graft dynamic hip screws. (a) The head section, which is threaded and has some holes in it, is used to fix the femoral head. (b) The middle section, which has a flabellum-like-cavity for autogenous bone and bone morphogenetic protein 2 composite materials. (c) The end section, which connects 135° angle plate. (d) The 135° angle plate
