Fig. 2.

a Preoperative anteroposterior (AP) radiograph of the left hip in a symptomatic 42-year-old man with osteonecrosis of the femoral head (ONFH). b Preoperative MRI of the femoral heads confirms the presence of a Steinberg 2c osteonecrotic lesion. c Six months follow-up AP radiograph of the same hip after core decompression, injection of autologous bone marrow concentration and backfilling of core tract with PRO-DENSE. d An AP radiograph taken 30 months after the index procedure shows no collapse of the femoral head and degradation of the ceramic with bone ingrowth and bony remodelling