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The study aimed to evaluate the changes in pelvic tilt during periacetabular osteotomy (PAO) and its effect on acetabular reorientation. The study analyzed the ratio of the pubic symphysis height to the sacroiliac width (PS-SI) in patients with dysplasia and acetabular retroversion who underwent uni- and bilateral PAO. The PS-SI ratio decreased during surgery in all subgroups, indicating retrotilt of the pelvis. Correct pelvic orientation during surgery is crucial for accurate acetabular reorientation, and not taking into account retrotilt during PAO can result in femoroacetabular impingement. The study recommended adjusting the central beam to compensate for the retrotilt of the pelvis during surgery.
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