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Fit and fill analysis of a newly designed femoral stem in cementless total hip arthroplasty for patients with secondary osteoarthritis

  • Original Articles
  • Published:
Journal of Orthopaedic Science

Abstract

The fit and fill of the femoral canal are critical to the success of cementless femoral stems in total hip arthroplasty. It is difficult for conventional stems to provide a good fit and fill for the femora of patients with secondary osteoarthritis. Based on measurements of 100 femora of these patients, we designed two types of Fukui Medical School (FMS) stems with a proximal lateral flare that differed in the medial radius. We compared the fit and fill of the FMS stems with those of four conventional stems, using computer simulation. The mean proximal fit and total fit of the FMS stems were 46% and 53% respectively, a significant improvement compared with the other stems examined. The mean fill of FMS stems was 82% at the lower end of the lesser trochanter and 84% at the upper end of the isthmus, values that were significantly higher than those of the other stems. Since September 1995, we have implanted FMS stems in 15 hips with secondary osteoarthritis. Radiographic evaluations showed that the canal fill of the FMS stems was significantly greater in the proximal femur compared with other stems previously inserted at our department.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Fukui Medical School, Shimoaizuki 23, 910-11, Matsuoka, Fukui, Japan

    Akihiko Bo, Shinichi Imura, Hironori Omori, Yasuhiro Okumura, Masao Ando & Hisatoshi Baba

  2. Hayes Medical, 819 Striker Avenue, Suite 10, 95834-1129, Sacramento, CA, USA

    Patrick White

  3. Osteonics Corporation, 59 Route 17, 07401-1677, S. Allendale, NJ, USA

    Al Zarnowski

Authors
  1. Akihiko Bo
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  2. Shinichi Imura
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  3. Hironori Omori
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  4. Yasuhiro Okumura
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  5. Masao Ando
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  6. Hisatoshi Baba
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  7. Patrick White
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  8. Al Zarnowski
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Bo, A., Imura, S., Omori, H. et al. Fit and fill analysis of a newly designed femoral stem in cementless total hip arthroplasty for patients with secondary osteoarthritis. J Orthop Sci 2, 301–312 (1997). https://doi.org/10.1007/BF02488914

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  • DOI: https://doi.org/10.1007/BF02488914

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