Fig. 4

Radiographs of a 20-year-old male with idiopathic ONFH, ARCO IIIB, JIC C2. a and b A large area of bone density change can be seen on the X-rays (anterio-posterior and frog position) before the operation, and the femoral head is obviously collapsed and deformed. c and d X-rays (antero-posterior and frog position) of the patient with SHD combined with bone graft at 2 years after operation, and it can be observed that the collapse of the femoral head has not become more serious, and the bone density in the necrotic area has increased. e and f X-rays (antero-posterior and frog position) of the patient at six years after operation, it can be observed that the shape of the femoral head is maintained well, the collapse of the femoral head has not progressed, the density is increased, most of the necrotic area is repaired, the joint space remains normal, and there is no subluxation of the hip joint