title: Analysis of different material theories used in a FE model of a lumbar segment motion.
abstract: In this study, a nonlinear poroelastic model of intervertebral disc as an infrastructure was developed. Moreover, a new element was defined consisting a disc (Viscoelastic Euler Beam Element) and a vertebra (Rigid Link) as a unit element. Using the new element, three different viscoelastic finite element models were prepared for lumbar motion segment (L4/L5). Prolonged loading (short-term and longterm creep) and cyclic loading were applied to the models and the results were compared with results of in vivo tests. Simplification of the models by using the new element leads to reduction of the runtime of the models in dynamic analyses to few minutes without losing the accuracy in the results.
authors: Department of Bioengineering, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran. e.gohari@srbiau.ac.ir
authors: Ehsan
authors: E
authors: Gohari
authors: Mohammad
authors: M
authors: Nikkhoo
authors: Mohammad
authors: M
authors: Haghpanahi
authors: Mohammad
authors: M
authors: Parnianpour
mesh_terms: D001696:Biomechanical Phenomena; D004548:Elasticity; D020342:Finite Element Analysis; D006801:Humans; D008159:Lumbar Vertebrae / Q000033:anatomy & histology* / Q000502:physiology*; D008953:Models, Anatomic; D009038:Motion; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D014783:Viscosity; D016474:Weight-Bearing