The cemented stems of two cases were revised with cementless stems of bipolar hip prosthesis. In one patient, the femoral shaft was perforated by the drill. In another patient, a fracture of upper medial site of the femoral shaft was recognized by postoperative roentgenogram. The fracture was due to unremoved bone cement conecting to the lateral part of inner surface of the femoral canal. Prevention of these complications needs meticulous attentions. For example, preparation of operative instruments, and the careful intraoperative procedure.