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Purpose <p>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.</p> Methods <p>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.</p> Results <p>Eleven hips underwent total hip arthroplasty. Overall joint survival was 98.1% at ten years and 78.5% at 20&#xa0;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; <i>p</i> = 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 <i>p</i> &lt; 0.001), but was not externally validated.</p> Conclusion <p>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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年7月27日

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

摘要

Purpose

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.

Methods

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.

Results

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.

Conclusion

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.