Establishment Of A Finite Element Model Of Lumbar Spine And Simulation Research Of Optimal Angle Of Traction

With the speeding up of people’s life rhythm, the morbidity of lumbarintervertebral disc protrusion is higher and higher and gradually tends to bediscovered from the young. Among mountains of treatments, traction treatment, forits unique advantages, is adopted widely. For the natural curve of the human spine,the traditional traction can not offer targeted treatment to the pathologicalintervertebral disc so that it is important to study optimal traction angle of eachintervertebral disc. In the field of biomechanics, the finite element analysis methodtends to be increasingly mature. Compared with the traditional method ofexperiment biomechanics, it has better repeatability and controllability. The finiteelement analysis method can help to exactly set up lumbar intervertebral disc modeland calculate each section’s stress under different experiment conditions.Based on CT data, this research makes use of Mimics software to rebuild themodel of lumbar spine bone and import it to Geomagic Studio to generategeometric model of lumbar intervertebral disc which is properly fit the adjacentvertebra and to repair the surface. Then substantialize all the mesh model of thevertebra and intervertebral disc to build CAD model. Then import the CAD modelinto the Ansys to build the finite element model for the whole lumbar vertebra bygiving the model material property, element type, gridding, defining contact.Compared with the results gained from the experiment, the results gained by thesimulated analysis to the axial tension and contraction prove the finite elementmodel to be right. First, simulate the traction process of lumbar vertebra by givingthe same restrain as the traction treatment; second, make sure the optimal tractionangel of each intervertebral disc by optimizing design method.This thesis offers a method that can establish a three-dimensional finiteelement model of human lumbar spine accurately and rapidly. According to thedemands of biomechanics experiment，the model can be given restrain and taken afinite element analysis. The results show that human spine has a feature of naturalcurve and each lumbar intervertebral disc has its own optimal traction angle so that we can give a targeted treatment to the pathological intervertebral disc by adjustingtraction angle clinically.