| Project/Area Number |
07671577
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Orthopaedic surgery
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| Research Institution | Fukui Medical University |
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Principal Investigator |
IMURA Shinichi Fukui Medical University, Department of Orthopaedic Surgery, Professor, 医学部, 教授 (90019886)
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| Co-Investigator(Kenkyū-buntansha) |
OKUMURA Yasuhiro Fukui Medical University, Department of Orthopaedic Surgery, Assistant, 医学部, 助手 (30204150)
OMORI Hironori Fukui Medical University, Department of Orthopaedic Surgery, Assistant Professor, 医学部・附属病院, 講師 (70242592)
BABA Hisatoshi Fukui Medical University, Department of Orthopaedic Surgery, Associate Professor, 医学部, 助教授 (00165060)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1996: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | cementless total hip arthroplasty / fit & fill / three-dimensional computer simulation / non linear three-dimensional finite element analysis / relative motion / 相対的変位量 / Fit & Fill |
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| Research 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. We designed two types of Fukui Medical School (FMS) stem with a proximal lateral flare that were different in the medial radius. We compared the fit and fill, the amount of stem-bone relative motions, and load transfer to the femur among the newly designed stems and conventional stems, using a computer simulation and non-linear 3-D finite element (FE) analysis (ADINA6.1 software). The mean proximal fit and total fit of the FMS stems were 46% and 53% respectively, with a significant improvement compared with other stems. The mean fill of FMS stems was 82% at the lower and of the lesser trochanter and 84% at the upper end of the isthmus, which were significantly higher than those of other stems. The FMS showed less proximal lateral relative motion and more load transfer to the proximal femur compared with conventional stem (Omnifit).
It suggests that the FMS will be expected to have a better adaptation of the femur with secondary osteoarthritis and biomechanical stability than conventional stems in early postoperative period.
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