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2 Acta of Bioengineering and Biomechanics

2 2005

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Three-dimensional nonlinear finite element model of the human lumbar spine segment

Lodygowski T., Kąkol W., Wierszycki M., Ogurkowska M.

Acta of Bioengineering and Biomechanics

2005

Vol. 7, nr 2

17-28

The objective of this paper is a three-dimensional modelling of vertebral segment (L4-L5), which can be used for numerical simulation of surgery, analysis of spinal equilibrium and stability. Because of the extreme complexity of finite element modelling we propose to carry out analyses on the simplified model. The geometry of vertebrae is known due to the computer tomography (CT) or nuclear magnetic resonance (NMR). CAD model is built and then imported into FEA program. The model under consideration, i.e. the model of spinal segment, consists of two bones and an intervertebral disc. The mechanical properties of tissues, boundary/interaction conditions and loadings accepted for computations are based on the literature and our own studies. The simplified model was proposed, developed and validated for several loading schemes, including axial compression, bending and torsion.

Three-dimensional nonlinear finite element model of lumbar intervertebral disc

Lodygowski T., Kąkol W., Wierszycki M., Ogurkowska M.

Acta of Bioengineering and Biomechanics

2005

Vol. 7, nr 2

29-37

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 cary* 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.