Calculation And Analysis Of Spinal Correction

The incidence of adolescent idiopathic scoliosis is increasing year by year,and its impact on patients' physical and mental health is attracting more and more attention.At present,hospitals mainly treat patients with scoliosis by the way of orthosis and internal fixation,which principles include applying appropriate orthopedic force to the spinal column,so as to drive the side bend spine return to normal.Therefore,for the treatment of scoliosis,proper orthodontic force loading is a fundamental factor.Combined with the literature of medicine and mechanics,the paper calculates and analyzes the orthopedic force of the scoliosis,and verifies the correction of the orthopedic force by the finite element simulation and the correctness of the theoretical basis of the orthopedic force loading proposed in this paper.It provides a universal and feasible method for scoliosis orthopedic force calculation in clinical treatment of scoliosis.(1)Based on the patients' CT data,the paper analyses the scoliosis characteristics of patients and collects the coordinate positions of the part of the scoliosis T4-L3 in the Mimics software.Fitting the curve of the characteristic of the scoliosis accurately in the MATLAB software,it solves the constitutive equation.The Cobb angle of scoliosis is automatically measured by programming.The location of the top side scoliosis and its displacement are measured.Based on spinal biomechanical data and clinical department of orthopedics data,the orthopedic force is analyzed and calculated by curved sling model equivalent to scoliosis.By introducing the comprehensive elastic modulus of the spine,a functional relation between orthopedic force and orthopedic angle under different orthopedic forces is deduced.(2)In order to calculate the comprehensive elastic modulus of the spine and verify the validity of the relationship between the correction force and the orthopedic angle,based on the CT scan data of the patients' clinical medicine,the T4-L3 vertebra model of the patient was established by the Mimics 17.0 software which is the medical reverse engineering software.Introducing it into the Geomagic wrap 2015,the surface roughness of polygonal models is optimized and the triangular patches are evenly optimized.Based on the optimized vertebrae model,we designed a spinal intervertebral disc in 3D-matic software.Finally,the intervertebral disc and the spine were introduced into Geomagic wrap2015 software to eliminate the overlap between vertebrae by Boolean operation,and the polygon model was modeled accurately,and the accurate geometric model of the spinal scoliosis was generated by establishing suitable surface pieces.(3)According to the literature data,we determined the material properties,the type of mesh element and the connection properties between different tissue of each tissue in the finite element model of spine.Hypermesh10.0 software is used to divide the spine grid,check the quality of the grid,assign attributes to the grid,define the type of unit and contact relationship,and simulate the different ligaments of the spinal column by assigning different attributes to the link cell grid.A higher similar finite element model is established of the patients' scoliosis.(4)We made comparisons between the finite element model and the clinical X slices to verify the geometric similarity of finite element models.The effectiveness of the finite element model is verified by comparing the results from the finite element model and the similar literature.(5)Finally,the finite element simulation software ANSYS 15.0 was used to calculate with different loads.The calculation results calculated the spinal comprehensive elastic modulus,and the size of the best orthopedics and the position.