Finite Element Analysis Of Development Tendency Preditiction And Orthopedic On Scoliosis

Adolescent idiopathic scoliosis (etiology remains unknown) is one of the scoliosis diseases which keeps the highest incidence rate and biggest damage. The researches of which mechanics have been a hotspot multidisciplinary researchers involved in. This topic was supported by the nature fund of Yunnan province, and created among the communication and cooperation between our institute and the orthopedic departments of the second affiliated hospital of Kunming medical college. Aim at establishing the 3D finite element spinal models of patients and exploring the biomechanical properties, finally provide mechanical basis for the validation and optimization of specific clinic surgery of posterior vertebral column resection (PVCR) adopted by the orthopedic departments of the second affiliated hospital of Kunming medical college.Based on the CT scan images of real patient offered by hospital, Mimics10.01, Geomgic12, UG 8.03D modeling software and Workbench software of finite element analysis were applied, the adjusted adolescent idiopathic scoliosis 3D finite element model was created successfully, and the CVSL and biomechanical properties were proved effective. Two aspects of the work in this article were performed combined with the real weight data of patient and a specific PVCR orthopedic operation scheme offered by doctor:1. Predict the spinal development and changes of the patient without any orthodontic treatment after one year.2. Correct the spinal model of patient with specific PVCR orthopedic scheme, and observe the overall change of the spine and the stress and strain status of "screw-rod" system and the vertebral bodies and intervertebral discs of important segments after corrected qualified, so as to provide reference for operation optimization. The conclusions are as follows:(1) The average stress the spinal concave sides of patient could bear are bigger than the convex sides without any orthodontic treatment, the spinal deformity of patient will increase after one year, and the Cobb angle of main bend will increase 3.1°,the Cobb angle of secondary bend will increase 1.13°.(2) The spine of patient could recover back to ideal situation after specific PVCR orthopedic surgery, and the height of patient will increase 32.22mm.(3) In this orthopedic operation scheme, thoracic vertebra T8, T9, T10 which in the middle of main bend and secondary bend will afford the biggest stress, special attention are needed on the operation.(4)In this orthopedic operation scheme, the stress of thoracic vertebra T3 and lumbar vertebra L4 which regarded as end vertebra to screw are still bigger, so do the thoracic vertebra T5, T6, T11 and lumbar vertebra L1 which are close to where to load the orthodontic force. In general, the stress of intervertebral discs are bigger in the annular fibrosus, nucleus pulposus are smaller.Although some spinal tissues had been ignored or simplified compared with real human body in this article, but the whole structure of the model is better, and the surgery simulation were close to the real operation process. Some conclusions were drawn, reference of the mechanical aspects could be provided to the PVCR orthopedic validation and optimization of patients.