Fig. 5

Clinical case presentation. A 29-year-old woman, bilateral hip pain for 3 months with glucocorticoid use for 3 years before hospital admission. MRI T1WI (a), T2WI (b), and anteroposterior X-ray film (c) showed stage 2c osteonecrosis of two hips according to the ARCO classification. Two years after robot-assisted core decompression of two femoral heads, X-ray film showed the collapse of the left femoral head (d) with the right side intact. Finally, the patient received a total hip replacement of the left hip joint (e)