著者

藤巻 洋 稲葉 裕 小林 直実 雪澤 洋平 鈴木 宙 池 裕之 手塚 太郎 平田 康英 齋藤 知行

出版者

Japanese Society for Joint Diseases

雑誌

日本関節病学会誌 (ISSN:18832873)

巻号頁・発行日

vol.32, no.1, pp.17-22, 2013 (Released:2014-06-26)

参考文献数

12

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Objective: The aims of the present study were first to investigate the frequency and location of bone cysts in the acetabulum of hip osteoarthritis (OA) patients and second to examine the influence of pelvic tilt on the location of bone cysts in the acetabulum.Methods: A total of 80 patients (65 women and 15 men) with hip OA who underwent primary total hip arthroplasty were included in this study. The mean age at surgery was 65 years (range, 43-83 years). The bilateral hips of these 80 patients were examined; however, 9 contralateral hips that had previously been implanted with prostheses were excluded. We evaluated the minimal joint space width (MJS) on preoperative antero-posterior radiographs of the pelvis in the standing position. We also obtained the digital imaging and communication in medicine (DICOM) data from the preoperative pelvic computed tomography (CT) images, and then three-dimensionally reconstructed the DICOM data using OrthoMap 3D software with reference to the anterior pelvic plane. We divided the acetabulum into six areas and examined the presence of bone cysts in each area. We also examined the degree of pelvic tilt with three-dimensionally reconstructed CT images.Results: The frequency of bone cysts on CT images increased when the MJS of the hip joint on radiographs of the pelvis was less than 2 mm (p < 0.05). In the total of 151 hips, the antero-lateral area of the acetabulum (88 hips, 58%) exhibited the highest frequency of bone cysts. Patients who had bone cysts in the anterior part of the acetabulum tended to have a larger value of pelvic retroversion than those who did not have cysts in the anterior part of the acetabulum; however, the difference was not significant.Conclusion: The antero-lateral area of the acetabulum, which exhibited the highest frequency of bone cysts, is thought to be susceptible to loading stress. We hypothesized that patients who have bone cysts in the anterior part of the acetabulum have larger retroversion of the pelvis than others; however, the difference was not significant. We need to investigate further to reveal the influence of pelvic tilt on the location of bone cysts.