Hayashi S, Hashimoto S, Matsumoto T, et al. - This study was intended to assess whether and how preoperative bone morphology is correlated with the postoperative range of motions (ROMs) to prevent postoperative FAI after periacetabular osteotomy. Researchers recruited a total of 68 individuals (71 hips) with hip dysplasia who had undergone curved PAO. They assessed the pre- and postoperative three-dimensional center-edge (CE) angles and correlated with the postoperative ROM. An association was found between preoperative medial anterior acetabular coverage and postoperative anterior acetabular coverage. Moreover, the data demonstrate that the combination with preoperative medial anterior acetabular coverage and femoral anteversion can prognosticate postoperative internal rotation at 90° flexion. Thus, the diagnosis of acetabular reorientation should be carefully recognized when the individuals have high preoperative medial anterior CE angle and small femoral anteversion.