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1998 Fiscal Year Final Research Report Summary

Mechanical Evaluation of Fracture in the Proximar Femur during Falls and Development of Hip Protector

Research Project

Project/Area Number 09650096
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Materials/Mechanics of materials
Research InstitutionNagoya University

Principal Investigator

TANAKA Eiichi  Nagoya University, School of Engineering, Professor, 工学研究科(寄附講座), 教授 (00111831)

Co-Investigator(Kenkyū-buntansha) HARADA Atsushi  Chubu National Hospital, Department of Orthopedic Surgery, Director, 長寿医療研究センター・整形外科, 医長(研究職)
KAJZER Janusz  Nagoya University, School of Engineering, Professor, 工学研究科(寄附講座), 教授 (70283398)
Project Period (FY) 1997 – 1998
KeywordsBiomechanics / Femur / Bone Fracture / Fall / Finite Element Analysis / Experiment / Aged Society
Research Abstract

In the present study, in order to examine the cause of hip fracture by falls, we performed the following studies : 1) experiments to simulate falls by use of cadaveric femora, 2) finite element analyses to use finite element models created from X ray computed tomographic images of cadaveric femora, 3) construction of the system creating finite element models for individual femora. The results obtained are summarized as follows :
1. Static loads were applied to cadaveric female femora (aged 89-95), and the relation between the fracture risk and the load direction was discussed. The results showed that the stress concentration is observed in the superior subcapital and posterior basicervical regions.
2. From the impact tests for 10 cadaveric femora (aged 77-94), it was found that femoral neck fractures are mainly caused by compressive stresses, and that the femoral shapes and bone density influence the type of fracture.
3. In the results of the finite element analyses with the model from the left cadaveric femur 65 ages male, the fracture risk on the posterior basicervical region increased with the rotation angle around the diaphyseal axis.
4. It was thought that the differences of shapes among specimens had some influences on femoral neck fracture. Hence we developed a method that constructs individual finite element models of proximal femur by using the minimum amount of morphological parameters of femur.
5. By this method, we can construct the models in shorter time than before, and moreover it became much easier to perform the finite element analyses taking account of individual femoral shapes.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 田中英一: "三次元有限要素解析による転倒時の大腿骨近位部骨折の力学的検討" 日本機械学会講演論文集. No.983-1. 31-32 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okuizumi: "Effect of Trochanteric Padding System Using Dropped-Weight Impact Testing" Abstracts of Third World Congress of Biomechanics. 432-432 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 奥泉宏康: "三次元有限要素モデルを用いた転倒時荷重条件の違いによる大腿骨頚部骨折型の検討" 日本整形外科学会基礎学術集会. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田中英一: "有限要素解析と実験に基づく大腿骨近位部骨折の力学的検討" 日本機械学会講演論文集. 98-2. 199-200 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 奥泉宏康: "大腿骨頚部骨折型と転倒時荷重方向の検討" 第25回日本臨床バイオメカニクス学会. 112-112 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Okuizumi: "Different Load Conditions during Falls Predict Cerrical and Troehanteric Hip Fracture Using Three-Dimensional Finite Element Model" American Society of Bone and Mineral Research & International Bone and Mineral Society Joint Meeting. (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Tanaka et al.: "Mechanical Evaluation of Fracture in the Proximal emur during Falls by Three-Dimensional Finite Element Analysis" Preprint of the Japan society of Mechanical Engineers. Vol.983-1. 31-32 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okuizumi et al.: "Effect of Trochanteric Padding System Using Dropped-Weight Impact Testing" Abstracts of Third World Congress of Biomechanics. 432-432 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okuizumi et al.: "Examinations of Effects of Load Conditions during Falls on the Type of Hip Fracture by Three-Dimensional Finite Element Analysis" Preprint of the Japan Society of Orthope-dic Surgery. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Tanaka et al.: "Mechanical Evaluation of Fracture in the Femur Based on Finite Element Analy-sis and Experiments" Preprint of the Japan Society of Mechanical Engineers. Vol.98-2. 199-200 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okuizumi et al.: "Type of Hip Fractures and Load Conditions during Falls" Abstract of 25th Conference of Japan Clinical Biomechanics. 112-112 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Okuizumi et al.: "Different Load conditions during Falls Predict Cervical and Trochanteric Hip Fracture Using Three-Dimensional Finite Element Model" American society of Bone and Mineral Research & International Bone and Mineral Society Joint Meeting. (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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