Fig. 4

Female, 43 years, aseptic loosening. a Preoperative X-ray showed that the stem was well fixed and was removed by using ETO. b Anteroposterior and lateral X-rays immediately after operation (b1 and b2). MP stem was used to treat with intraoperative medial femoral cortical fracture (yellow arrow). X-ray showed nonunion of the ETO osteotomy fragment (green arrow). c Anteroposterior and lateral X-rays two years after operation (c1 and c2) showed bone atrophy in osteotomy line (green arrow). The medial cortical fragment was nonunion and migrated (yellow arrow). Osteopenia of medial cortical bone due to fracture and loosening