Abstract
Background
We believe a curved periacetabular osteotomy is indicated for treatment of severe dysplastic hips with center-edge angles less than 0°, classified as Severin Group IV-b. However, the lower limit of the center-edge angle in hips classified as Severin Group IV-b is not clearly defined to determine which patients should receive periacetabular osteotomy alone.
Questions/purposes
We retrospectively compared the results of curved periacetabular osteotomies performed for the treatment of severe (Severin Group IV-b: center-edge angle < 0°) and moderate (Severin Groups III and IV-a: center-edge angle ≥ 0°) dysplastic hips. We investigated the lower limit of the center-edge angle, which was corrected by a curved periacetabular osteotomy alone in Severin Group IV-b hips.
Patients and Methods
We divided 191 hips in 163 patients into moderate (147 hips) and severe (44 hips) dysplastic hip groups. Minimum followup was 2 years (mean, 70.9 and 70.6 months, respectively). Clinical evaluations were performed using the Harris hip score. Radiographic measurements included the center-edge angle, acetabular head index, acetabular roof obliquity, and head lateralization index. Complications were compared between the two groups.
Results
All clinical and radiographic postoperative parameters showed satisfactory improvement over the preoperative parameters in both groups. The postoperative acetabular roof obliquity and head lateralization index were equivalent between the two groups. Eleven hips deteriorated to end-stage osteoarthritis. No complications were specifically associated with the severe dysplastic hips.
Conclusions
Curved periacetabular osteotomy alone for treatment of severe dysplastic hips with preoperative center-edge angles as low as −20° and classified as Severin Group IV-b restored weightbearing area and medialization.
Level of Evidence
Level III, therapeutic study. See Instructions for Authors for a complete description of the levels of evidence.
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Acknowledgments
We thank Dr. Takeshi Teratani and Dr. Akinori Takeyama for their invaluable advice during the course of this study.
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Each author certifies that he/she has no commercial associations (eg, consultancies, stock ownership, equity interest, patient/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
Each author certifies that his or her institution approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained
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Karashima, H., Naito, M., Shiramizu, K. et al. A Periacetabular Osteotomy for the Treatment of Severe Dysplastic Hips. Clin Orthop Relat Res 469, 1436–1441 (2011). https://doi.org/10.1007/s11999-010-1616-x
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DOI: https://doi.org/10.1007/s11999-010-1616-x