Fig. 2A–C.

(A) The image of the hip of a 32-year-old man whose main complaint was left hip area pain for 6 months that was more severe over the previous 3 days is shown. Osteolytic lesions can be seen in the left pubis, ischium, and periacetabular region on the plain film. The femoral head was dislocated and protruded into the pelvic cavity. (B) The tumor was resected wide, including the whole pubis and ischium, and the superior cut line was at the normal bone above the acetabulum. (C) A hemipelvic prosthesis was used for reconstruction of the defect after tumor resection. The prosthesis was fixed at the residual ilium, and bone cement was placed around the periacetabular prosthesis to reinforce the stability. The pubic plate was fixed between the acetabular and contralateral pubis.