Residual acetabular roof obliquity is associated with long-term joint preservation after transposition osteotomy of the acetabulum.

Authors

Takafumi Miyata, Kenji Kitamura, Masanori Fujii, Goro Motomura, Satoshi Hamai, Shinya Kawahara, Ryosuke Yamaguchi, Takeshi Utsunomiya, Soichiro Yoshino, Yasuharu Nakashima

Published in

International orthopaedics. Jul 27, 2026. Epub Jul 27, 2026.

Abstract

To evaluate whether residual post-operative acetabular roof obliquity is associated with long-term joint preservation after transposition osteotomy of the acetabulum for hip dysplasia.
This retrospective study included 52 hips with pre-operative Tönnis grade 0 or 1 osteoarthritis and complete electronic radiographic datasets after transposition osteotomy of the acetabulum performed between 1996 and 2005. Conversion to total hip arthroplasty was the primary endpoint. Because only 11 conversions occurred, associations were evaluated using Kaplan-Meier analysis and univariable Cox regression. A 20-year receiver operating characteristic analysis and secondary analyses using a composite structural-failure endpoint and available patient-reported outcomes were exploratory.
Eleven hips underwent total hip arthroplasty. Overall joint survival was 98.1% at ten years and 78.5% at 20 years. Higher post-operative acetabular roof obliquity was associated with conversion in univariable Cox regression (hazard ratio 1.10 per degree, 95% confidence interval 1.03 to 1.18; p = 0.005). The 20-year receiver operating characteristic analysis included 38 hips and showed moderate discrimination (area under the curve 0.73, 95% confidence interval 0.48 to 0.94). The internally derived 6.1-degree threshold separated 20-year survival (92.4% versus 45.7%; log-rank p < 0.001), but was not externally validated.
In this selected transposition osteotomy cohort, residual post-operative acetabular roof obliquity showed an unadjusted association with long-term total hip arthroplasty conversion. The data-derived threshold should be regarded as exploratory and requires external validation.

PMID:
42503545
Bibliographic data and abstract were imported from PubMed on 27 Jul 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.