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A Novel Compliant Fixation Plate for Bone Fractures

[+] Author Affiliations
Kwangwon Kim, Doo-Man Kim

Korea Aerospace University, Goyang, Korea

Jaehyung Ju

University of North Texas, Denton, TX

Paper No. IMECE2012-88084, pp. 117-125; 9 pages
doi:10.1115/IMECE2012-88084
From:
  • ASME 2012 International Mechanical Engineering Congress and Exposition
  • Volume 2: Biomedical and Biotechnology
  • Houston, Texas, USA, November 9–15, 2012
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4518-9
  • Copyright © 2012 by ASME

abstract

Rigid bone fixation plates made of stainless steel or a titanium alloy are used as supplemental support structures when a fracture occurs in a long bone. These fixation plates are about an order of magnitude higher in elastic modulus than that of cortical bones, which may cause high interface stress between the fixation plate and the bone. Moreover, when they are used for a bone fracture in a child, they may prevent bone growth due to their high stiffness in the longitudinal direction. In this study, we suggest a novel fixation plate that controls for the stiffness and elastic elongation in the uni-axial loadings, namely tension and compression. Using a flexure based compliant mechanism and cellular structures, uni-axial load-deflection curves are generated in tensile and compression loads. A commercial finite element (FE) code, ABAQUS, is used for a parametric study of the geometric effect of the cellular structures on stiffness and elastic elongation. Performance of the designed fixation plate is validated by an FE analysis for bone tension and compression under a contact condition between the bone and fixation plate.

Copyright © 2012 by ASME
Topics: Bone fractures

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