Fig. 1

a Preoperative radiograph of a 73-old-year man with primary osteoarthritis of the hip joint. b Postoperative radiograph shows the excellent implant position of cementless total hip arthroplasty using the posterolateral approach. c Postoperative whole lower extremity radiograph of the prosthetic leg taken while standing. d At 5 years after the operation, the radiograph shows stable fixation of the components with a radiolucent line around the proximal femoral stem