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The Journal of Bone and Joint Surgery (American) 84:552-556 (2002)
© 2002 The Journal of Bone and Joint Surgery, Inc.

Scientific Article

Magnetic Resonance Imaging Pelvimetry Before and After a Periacetabular Osteotomy

Robert T. Trousdale, MD, Miguel E. Cabanela, MD, Daniel J. Berry, MD and Doris E. Wenger, MD

Investigation performed at the Mayo Clinic, Rochester, Minnesota

Robert T. Trousdale, MD
Miguel E. Cabanela, MD
Daniel J. Berry, MD
Doris E. Wenger, MD
Mayo Clinic, 200 First Street S.W., Rochester, MN 55905. E-mail address for R.T. Trousdale: trousdale.robert{at}mayo.edu

The authors did not receive grants or outside funding in support of their research or preparation of this manuscript. They did not receive payments or other benefits or a commitment or agreement to provide such benefits from a commercial entity. No commercial entity paid or directed, or agreed to pay or direct, any benefits to any research fund, foundation, educational institution, or other charitable or nonprofit organization with which the authors are affiliated or associated.

Background: The majority of patients who undergo a reconstructive pelvic osteotomy because of symptomatic hip dysplasia are young women of childbearing potential. The purpose of this paper was to evaluate the effect of periacetabular osteotomy on the dimensions of the pelvic inlet and outlet in these patients.

Methods: The dimensions of the osseous pelvis of seven women with symptomatic hip dysplasia were measured with use of magnetic resonance imaging pelvimetry before and after periacetabular osteotomy. Four measurements were made: the bispinous diameter, the anterior-posterior inlet measurement, the anterior-posterior midpelvis measurement, and the transverse inlet measurement. Radiographic correction obtained with the osteotomy was documented with preoperative and postoperative anteroposterior pelvic and false-profile radiographs.

Results: Periacetabular osteotomy improved the Tönnis angle and the Lequesne angle of the hip joint to an average of 8° and 30°, respectively. The hip center of rotation was medialized an average of 8 mm. None of the four measurements made with the magnetic resonance imaging pelvimetry decreased substantially after the periacetabular osteotomy.

Conclusion: Periacetabular osteotomy does not markedly alter the pertinent pelvic dimensions in young female patients.


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