Fig. 1

Patient (No. 13) with the diagnosis of OS in the right femoral neck. a White arrow indicated pathological fracture occurred during the chemotherapy pre-operation. b The immediate radiograph after the reconstruction with uncemented APC. c-d 12 months and 96 months post-operation: white arrows indicated the avulsion of the trochanteric fractures, while the black arrow indicated the resorption of the allograft bone. e-i The function of the hip, 96 months post-operation