Analysis Of Cervical Spine Function Based On Dynamic Image

The cervical spine,as the most flexible part of the human spine,is responsible for the activities above the human neck.With the increasing working time,long time to maintain the same posture makes a sharp increase in the number of cervical disease,and patients tend to be younger.Early functional changes will not cause people’s attention,while the changes of cervical spondylosis in most of the damage is irreversible.Therefore,the early prevention,diagnosis,preoperative and postoperative evaluation of the overall treatment of cervical spondylosis play a vital role.In this paper,on the basis of the detailed understanding of the anatomy of cervical vertebra structure,mechanics and kinematics knowledge,it made a reasonable simplification structure about the cervical spine.Through the relationship between vertebral displacement and angle,it extracted the feature parameters,which can be extracted in consecutive images obtained in the follow-up.The continuous image is the dynamic X-ray map of the cervical spine when flexion and extension in the sagittal position.By extracting the characteristic parameters of the continuous image,the motion trajectory of the vertebral body is analyzed,and the change of its motion features is calculated and compared.Finally,the finite element method was used to explain the cause of the change of the motion of the cervical spine under different stress conditions.The main work and innovation of this article are as follows:Firstly,basing on the analysis of the physiological structure of the cervical spine,the structure of the cervical spine is reasonably simplified,and a new idea is provided for the analysis of the continuous image by angle transformation.The motion of the cervical spine in sagittal plane was recorded by continuous multiple consecutive X-ray images.First,the region of interest is segmented after preprocessing the continuous image.Then we corrected uneven illumination based on double enhancement algorithm by morphological transformation and Retinex theory.The left edge of the vertebral bodies was extracted by combining the regional growth algorithm with the traversal.This edge reflects the motion trajectory of a single vertebral body.By analyzing the edge data,the relative position of the adjacent two vertebral bodies in the sagittal flexion and extension movement can be determined.Finally,by determining the size of the cervical vertebra,cervical FSU geometric model is established by SoildWork software,using Ansys finite element analysis software,through the unit types,determine the material properties and the grid operation,give the boundary conditions of displacement,impose pre-load and bending moment,simulate the stress in flexion extension and after get the stress nephogram,displacement and rotation of vertebral body,shows that the model has certain reliability.The pathological state was simulated by the finite element method,the stress,displacement and angle change of cervical vertebra provide the reason of flexion angle,the rate of change in motion in the sagittal plane,explain the reason of cervical continuous image adjacent vertebral body position changes,provides a new idea for the development and evaluation of preoperative diagnosis to clinical doctors.