A validated concept to model the bone-implant-compound for load-bearing implants in biomechanical finite-element-analyses

D. Kluess; T. Lindner; A. Fritsche; W. Mittelmeier; R. Bader

doi:10.1117/12.851330

14 April 2010 A validated concept to model the bone-implant-compound for load-bearing implants in biomechanical finite-element-analyses

D. Kluess, T. Lindner, A. Fritsche, W. Mittelmeier, R. Bader

Author Affiliations +

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75222I (2010) https://doi.org/10.1117/12.851330
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

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.

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D. Kluess, T. Lindner, A. Fritsche, W. Mittelmeier, and R. Bader "A validated concept to model the bone-implant-compound for load-bearing implants in biomechanical finite-element-analyses", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75222I (14 April 2010); https://doi.org/10.1117/12.851330

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KEYWORDS

Bone

Finite element methods

Infrared radiation

Calcium

Interfaces

Mathematical modeling

Reverse modeling

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