The Study Of Static And Dynamic Characteristics In Normal And Idiopatihic Soliosis Lumbosacral Spine Vertebra Structure

Scoliosis is a kind of three-dimensional spinal deformity that has the complex pathological features.Idiopathic scoliosis,the most common scoliosis,seriously threatens to adolescent in both physical and mental health.At present,the biomechanical properties of different types of scoliotic lumbosacral vertebra have not been deeply studied,especially the dynamic characteristics of the normal spine and different types of scoliotic lumbosacral spines in the special working environment.The required study will not only improve the accuracy of rehabilitation methods to treat scoliosis,but also provide scientific tools for the future research in precision medicine and rehabilitation,such as personalized treatment equipment.Therefore,it is very important to analyze the static and dynamic characteristics of scoliotic lumbosacral spine in the special living and working environment.In this paper,a normal lumbosacral spine and two types of lumbosacral model of idiopathic scoliosis,Lenke-4AN type and Lenke-5CN type,are selected as research subjects.By using Mimics and Geomagic Studio,three-dimensional graphical models of lumbosacral vertebras are established from the three-dimensional X-ray CT images of the subjects.And then,three-dimensional finite element models of lumbosacral vertebra are created from graphical models by using Abaqus.Using finite element computation,the static characteristics and the dynamic characteristics of scoliotic lumbosacral structure are analyzed in different vibration conditions.In study of the static properties,the change of stress and displacement of the lumbosacral vertebrae parts in the upright position are calculated.From studied results,we find the trend of displacement very closely relates to the structure of scoliotic spine.During the study the dynamic characteristics of the vertebrae in special vibration loads,moreover,What’s more,the study of the lumbosacral vertebrae in special vibration loads is to analyze the dynamic characteristic of the lumbosacral structure.Through the modal analysis of the finite element model of lumbosacral vertebrae,we can get natural frequency and vibration mode.The result showed that two kinds of scoliosis’ lumbosacral vertebrae in the low frequency environment are more sensitive than the normal lumbosacral vertebra.Through state harmonic response analysis,we can get the amplitude frequency characteristic curves of each feature point of lumbosacral vertebrae models.And then the natural frequency of the curves’ peak are easy to cause resonance.In summary,this paper takes a normal lumbosacral spine and two types of lumbosacral model of idiopathic scoliosis,Lenke-4AN type and Lenke-5CN type,as subjects.It combined with finite element theory and application of image technology to establish the three-dimensional finite element models of lumbosacral vertebrae.By using finite element tools,the static and dynamic analysis of lumbosacral vertebrae models were proceeded in standing position.Finally,the result provided a theoretical basis for the protection of lumbosacral vertebrae,and it also provided the reliability basis for the treatment or rehabilitation of scoliosis in the future.