Fig. 5

The receiver operating characteristic curves of the two independent morphological factors associated with abnormal maximum joint contact pressure after virtual periacetabular osteotomy. According to the curves, (A) the cut-off value of the anterior wall index was 0.21 (sensitivity 55%, specificity 88%, area under the curve [AUC] 0.77), and (B) that of the roundness index was 53.2% (sensitivity 82%, specificity 79%, AUC 0.84), on the preoperative standing pelvic radiographs