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A Study of Structural Behavior in Osteoporotic Trabecular Bone: Comparison Between Finite Element Analysis and Experiments With Fused Deposition Models

[+] Author Affiliations
Jan N. Eggert, Paul K. Wright

University of California at Berkeley, Berkeley, CA

Paper No. IMECE2002-32586, pp. 291-292; 2 pages
doi:10.1115/IMECE2002-32586
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Advances in Bioengineering
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Bioengineering Division
  • ISBN: 0-7918-3650-9 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

This project combines the topics of a) modern prototyping methods, b) studies on osteoporotic trabecular bone and c) engineering analysis using Finite Element Methods. The results are preliminary and serve as a basis for futures studies in bone mechanics. Specifically, the prototyping method of Fused Deposition Modeling was used to create a ‘scaled up’ model of a human trabecular bone. This type of bone was chosen because it is often afflicted by osteoporosis, a human condition that draws significant research attention. Thus the study described here was in part motivated by a larger research investigation into the structural behavior of degenerating human bones. The goal was to build and test a physical model and compare its behavior against a Finite Element Analysis (FEA) of the same structure. First, the model material was mechanically tested to determine Young’s modulus and Poisson’s ratio for input values to the FEA. An existing micro CT file was then adjusted for the first successful scaled bone model built on Fused Deposition Modeling. This physical model was equipped with strain gauges to determine localized strains, and successively tested in compression. (see Figure1.) The results were finally compared to the FEA, and an extensive error analysis was performed to relate physical analysis to computational assumptions.

Copyright © 2002 by ASME

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