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Does Compensatory Anterior Pelvic Tilt Decrease After Bilateral Periacetabular Osteotomy?

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Bilateral periacetabular osteotomy (PAO) surgery reduced compensatory anterior pelvic tilt in patients with acetabular dysplasia. The pubic symphysis to sacroiliac (PS-SI) index is a reliable measurement tool for assessing pelvic tilt changes after PAO.

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Area of Science:

  • Orthopedic surgery
  • Hip biomechanics
  • Pelvic anatomy

Background:

  • The relationship between lumbar spine, pelvic tilt, and hip is hypothesized but understudied in acetabular dysplasia.
  • Patients with acetabular dysplasia may exhibit compensatory anterior pelvic tilt, potentially influenced by acetabular reorientation.

Purpose of the Study:

  • To determine if compensatory pelvic tilt decreases after bilateral periacetabular osteotomy (PAO).
  • To validate the pubic symphysis to sacroiliac (PS-SI) index as a surrogate measure for pelvic tilt using a synthetic bone model.
  • To assess the interrater reliability of the PS-SI index.

Main Methods:

  • Retrospective analysis of 40 patients undergoing staged bilateral PAO.
  • Measurement of pelvic tilt using the PS-SI index on preoperative and postoperative radiographs.
  • Validation of the PS-SI index with a synthetic bone model and direct pelvic tilt measurement.
  • Assessment of interrater reliability using the intraclass correlation coefficient (ICC).

Main Results:

  • 93% of patients showed a decrease in pelvic tilt post-PAO, with a mean reduction of 8 mm in the PS-SI index (p < 0.001).
  • A strong linear correlation (R=0.99) was found between the PS-SI index and measured pelvic tilt in the synthetic bone model.
  • The PS-SI index demonstrated excellent interrater reliability both preoperatively (ICC=0.986) and postoperatively (ICC=0.988).

Conclusions:

  • Bilateral PAO leads to a modest reduction in anterior pelvic tilt, indicating acetabular reorientation influences pelvic position.
  • The PS-SI index is a reproducible radiographic tool for assessing pelvic tilt in patients with acetabular dysplasia.
  • Further research should explore the clinical implications of pelvic tilt changes, including potential effects on back pain.