Long-term results of periacetabular osteotomy for advanced-stage osteoarthritis secondary to developmental dysplasia of the
hip are reportedly unsatisfactory compared with results for early-stage osteoarthritis. Other preoperative information that
can be used to determine indications for periacetabular osteotomy is therefore important to avoid performing osteotomy in
young patients with advanced-stage osteoarthritis who would not likely achieve substantial benefit. We retrospectively reviewed
47 patients (49 hips) with advanced-stage osteoarthritis who underwent rotational acetabular osteotomy (RAO) using preoperative
congruency in abduction. The minimum postoperative followup was 8 years (mean, 12.3 years; range, 8–20 years) and mean age
at surgery was 43.1 years (range, 30–59 years). At followup, osteoarthritic stage was improved in 12 hips, unchanged in 24
hips, and had progressed in 13 hips. Preoperative joint congruency in abduction was good in 13 hips, poor in 32 hips, and
narrowed in four hips. Patients with better congruency in abduction had better results. We believe osteoarthritis with good
congruency in abduction preoperatively remains a good indication for RAO even in advanced stages of disease.
Level of Evidence: Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.
Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest,
patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
Each author certifies that his or her institution has approved the human protocol for this investigation and that all investigations
were conducted in conformity with ethical principles of research.