Porcine models in spinal research: Calibration and comparative finite element analysis of various configurations during flexion-extension

Hadi N. Aziz, Fabio Galbusera, Chiara Maria Bellini, Giuseppe Vincenzo Mineo, Alessandro Addis, Riccardo Pietrabissa, Marco Brayda-Bruno

Research output: Contribution to journalArticle

Abstract

This study was conducted to develop and calibrate a detailed 3-dimensional finite element model of the porcine lumbar spine and to compare this model with various configurations in flexion and extension. Computed tomography scans obtained from the L4-L5 lumbar segment of a Landrace x Large White pig were used to generate a solid volume. The various passive components were characterized by using a step-by-step calibration procedure in which the material properties of the anatomic structures were modified to match the corresponding in vitro data set-points retrieved from the literature. The range of motion of the totally assembled intact model was assessed under a 10-Nm flexion-extension moment and compared with data from a bilateral complete and hemifacetectomy configuration. In addition, the results from our porcine model were compared with published data regarding range of motion in a human finite element model in order to predict the configuration of the porcine model that most closely represented the human spine. Both the intact and hemifacetectomy configurations of the porcine model were comparable to the human spine. However, qualitative analysis of the instantaneous axis of rotation revealed a dissimilarity between the intact porcine model and human spine behavior, indicating the hemifacetectomy configuration of the porcine model as the most appropriate for spinal instrumentation studies. The present 3-dimensional finite element porcine model offers an additional tool to improve understanding of the biomechanics of the porcine spine and to decrease the expense of spinal research.

Original languageEnglish
Pages (from-to)174-179
Number of pages6
JournalComparative Medicine
Volume58
Issue number2
Publication statusPublished - Apr 2008

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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    Aziz, H. N., Galbusera, F., Bellini, C. M., Mineo, G. V., Addis, A., Pietrabissa, R., & Brayda-Bruno, M. (2008). Porcine models in spinal research: Calibration and comparative finite element analysis of various configurations during flexion-extension. Comparative Medicine, 58(2), 174-179.