Examples of preoperative radiographs and three-dimensional computed tomography (CT). A 23-year-old woman with right hip pain presented with acetabular dysplasia and a non-spherical femoral head-neck junction. Radiographs and three-dimensional CT images were taken prior to curved periacetabular osteotomy. (A) The centre-edge angle and acetabular roof obliquity were 19.0° and 13.0°, respectively. (B) The alpha angle was 61°. (C) The pelvic angle was 16.4° in the standing position, as indicated by the dashed lines. (D) The arrow indicates cam-type femoroacetabular deformity on a three-dimensional CT image.