Proximal femoral allograft. A and B, Extensive ectasia and osteolysis of proximal femoral cortex in 42-year-old woman with three previous failed revisions. Distal portion of stem remained well fixed and required slotting of femur for removal of cement and stem. C and D, Reconstruction with proximal femoral allograft. Long step-cut in graft covered cortical slot and improved rotational stability between graft and host bone. Stem was cemented to graft only and not distally.