Three-dimensional nonlinear finite element model of lumbar intervertebral disc
[ 1 ] Instytut Konstrukcji Budowlanych, Wydział Budownictwa, Architektury i Inżynierii Środowiska, Politechnika Poznańska | [ P ] employee
2005
scientific article
english
- biomechanics
- nonlinear FEA
- lumbar spine
EN The main objective of this study is to model a three-dimensional nonlinear finite-element vertebra disc, which can be used in further simulation of human lumbar spinal segments in surgery, analyses of spinal equilibrium and stability. Because of complexity of modelling it is proposed to carry out analyses on the simplified model built in such a way that the nonlinear response of the disc is replaced by a spring-type behaviour whose characteristics are obtained by computer simulations of an isolated disc. The geometry data of a human lumbar spinal segment, including a disc, is acquired from the computer tomography or magnetic nuclear resonance measurements, and a CAD model is designed and imported into FEA program. The simplified model was validated for loading schemes, including axial compression, bending and torsion acting on the spinal L4-L5 segment. Two models of intervertebra disc are shown and theirs advantages and accuracy are discussed.
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