Fig. 1

Radiographs of a 45-year-old woman are shown with right hip replacement for treating severe osteoarthritis. Dysplastic right hip with severe osteoarthritis was shown on the preoperative radiograph (a). Bilateral leg lengths were equal on the radiograph (b) at 1 month postoperatively. No complication was found until severe groin pain was complained at 5 months postoperatively. The swelling iliopsoas muscle (white arrow) was indicated on the anteroposterior radiograph (c) of 5 months postoperatively. d Computed tomographic scans of the painful hip at 5 months postoperatively. The enlarged iliopsoas (white arrow) with abnormal signal density was adhered to the thickened anterior capsule (white long arrow). e An over-anteverted acetabular component was detected on the computed tomographic scan at the level of acetabular component