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Proceedings Paper

A validated concept to model the bone-implant-compound for load-bearing implants in biomechanical finite-element-analyses
Author(s): D. Kluess; T. Lindner; A. Fritsche; W. Mittelmeier; R. Bader
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Paper Abstract

The finite element method is used in various approaches to solve biomechanical problems. We present a concept helping in the development of appropriate models of the implant-bone compound based on different software packages. The reconstruction of bone morphology is based on computed tomography (CT) data of the designated bone. After the bone is three-dimensionally reconstructed in the CAD-environment, virtual implantation can be undertaken. Differentiation of cortical bone and trabecular bone is realised by mapping the Hounsfield Units (HU), which are a measure of attenuation, from the CT-slices onto the nodes of the FE-mesh. The HU are mathematically treated as temperatures and are correlated with calcium density respectively bone stiffness in a temperature-dependent material model. In order to validate the presented approach, an experimental test-setup using a fresh-frozen human hemipelvis was designed. Rosette strain gauges were placed on the bone at five locations and a load corresponding to the maximum force during the gait cycle was applied by means of a universal testing machine. The same force was applied in the FE-model and the strain distribution as well as the micromotion was calculated. The minimum principal strains as a result of compression were calculated with a correlation coefficient of r2 = 0.94 resp. r2 = 0.86. Our concept is aimed at predicting the stress and strain states in the bone stock and within the implant and has the potential to predict relative interfacial micromotion.

Paper Details

Date Published: 14 April 2010
PDF: 7 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75222I (14 April 2010); doi: 10.1117/12.851330
Show Author Affiliations
D. Kluess, Univ. of Rostock (Germany)
T. Lindner, Univ. of Rostock (Germany)
A. Fritsche, Univ. of Rostock (Germany)
W. Mittelmeier, Univ. of Rostock (Germany)
R. Bader, Univ. of Rostock (Germany)

Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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