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Evaluation of articular cartilage following rotational acetabular osteotomy for hip dysplasia using T2 mapping MRI

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Abstract

Background

Rotational acetabular osteotomy (RAO) is one of the surgical treatments for acetabular dysplasia, and satisfactory results have been reported. We evaluated the postoperative changes of articular cartilage and whether the pre-operative condition of the articular cartilage influences the clinical results using T2 mapping MRI.

Methods

We reviewed 31 hips with early stage osteoarthritis in 31 patients (mean age, 39.6 years), including three men and 28 women who underwent RAO for hip dysplasia. Clinical evaluations including Japanese Orthopedic Association (JOA) score and Japanese Orthopedic Association Hip Disease Evaluation Questionnaire (JHEQ), and radiographical evaluations on X-ray were performed. Longitudinal qualitative assessment of articular cartilage was also performed using 3.0-T MRI with T2 mapping technique preoperatively, 6 months, and at 1 and 2 years postoperatively.

Results

There was no case with progression of osteoarthritis. The mean JOA score improved from 70.1 to 93.4 points, the mean postoperative JHEQ score was 68.8 points, and radiographical data also improved postoperatively. We found that the T2 values of the cartilage at both femoral head and acetabulum increased at 6 months on coronal and sagittal views. However, they significantly decreased 1 and 2 years postoperatively. The T2 values of the center to anterolateral region of acetabulum negatively correlated with postoperative JHEQ score, particularly in pain score.

Conclusions

This study suggests that biomechanical and anatomical changes could apparently cause decreased T2 values 1–2 years postoperatively compared with those preoperatively. Furthermore, preoperative T2 values of the acetabulum can be prognostic factors for the clinical results of RAO.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551, Japan

    Takeshi Shoji, Takuma Yamasaki, Soutaro Izumi, Mikiya Sawa & Nobuo Adachi

  2. Department of Diagnostic Radiology, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551, Japan

    Yuji Akiyama

  3. Department of Orthopaedic Surgery, Hiroshima Prefectural Rehabilitation Center, 295-3 Taguchi, Saijo-town, Higashi-Hiroshima, 739-0036, Japan

    Yuji Yasunaga

Authors
  1. Takeshi Shoji
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  2. Takuma Yamasaki
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  3. Soutaro Izumi
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  6. Yuji Yasunaga
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Correspondence to Takeshi Shoji.

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Shoji, T., Yamasaki, T., Izumi, S. et al. Evaluation of articular cartilage following rotational acetabular osteotomy for hip dysplasia using T2 mapping MRI. Skeletal Radiol 47, 1467–1474 (2018). https://doi.org/10.1007/s00256-018-2943-3

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  • DOI: https://doi.org/10.1007/s00256-018-2943-3

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