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  • Relation between ectopic ossification after total hip arthroplasty and activity of general inflammation in patients with ankylosing spondylitis

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Correspondence
Relation between ectopic ossification after total hip arthroplasty and activity of general inflammation in patients with ankylosing spondylitis
  1. YOSHITAKA TANI,
  2. JUNICHI NISHIOKA,
  3. KOJI INOUE,
  4. SINSUKE HUKUDA
  1. Department of Orthopaedic Surgery, Shiga University of Medical Science, Shiga, Japan
  2. Department of Rheumatology, Osaka Rosai Hospital, Osaka, Japan
  1. Dr Y Tani, Department of Orthopaedic Surgery, Shiga University of Medical Science, Tsukinowa-cho, Seta, Otsu, Shiga, 520–21, Japan.
  1. MASAKI TSUJIMOTO
  1. Department of Orthopaedic Surgery, Shiga University of Medical Science, Shiga, Japan
  2. Department of Rheumatology, Osaka Rosai Hospital, Osaka, Japan
  1. Dr Y Tani, Department of Orthopaedic Surgery, Shiga University of Medical Science, Tsukinowa-cho, Seta, Otsu, Shiga, 520–21, Japan.

https://doi.org/10.1136/ard.57.10.634

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    Ectopic ossification (EO) is a well known complication after total hip arthroplasty (THA). Some previous studies have considered ankylosing spondylitis (AS) a risk factor of EO, however other studies have refuted this association.1 The reported incidence of EO varies widely in different series.2

    We retrospectively studied a total of 20 primary THAs in 16 Japanese patients with definite AS. The age of the patients at surgery ranged from 30 to 64 years (mean 45). All THAs apart from three cases were performed using bone cement. Surgical exposure was achieved by the posterolateral approach. The length of follow up averaged 93 months (range 29 to 148). Compared with the incidence of EO in AS …

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