Biomechanical Study Of Simulated Correction Of Severe Rigid Lenke 3 Scoliosis In Adolescents

Objective: In this study,the finite element simulation commonly used clinical orthopedic surgical procedures were performed on the revised adolescent Lenke 3 severe rigid scoliosis model.To evaluate the biomechanics of scoliosis correction structure,explore the three-dimensional orthopedic effect and biomechanical characteristics of the surgical scheme.Methods: The imaging data of a 16-year-old male patient with Lenke 3 severe rigid scoliosis were selected as the research object,and the simulated orthopedic operation was performed on the modified model by using the finite element analysis software: bilateral upper and lower interbody screw placement combined with posterior Ponte osteotomy at the apex of the double main curved parietal vertebrae.Results: Using finite element software on the optimized and complete Lenke 3 adolescent idiopathic scoliosis model,the two designed surgical programs were completed.The results showed that the simulated vertebral Von Mises stress was located in the posterior column cortical bone of the vertebral body,maximum Von Mises stress is located at the pedicles of T9 and L2,respectively11.23 Mpa and 6.881Mpa;the correction rates of surgery for thoracic scoliosis were 79.78%,and for lumbar scoliosis were 73.91%,The maximum equivalent stress value of the pedicle screw was 192.56 MPa,located at T6,and mainly concentrated at the junction of the screw tail and the screw body.Conclusion: The common posterior surgery scheme was simulated and biomechanical analysis was carried out by the finite element analysis software on the modified model.The experimental results are the surgical plan for adolescent patients with severe rigid Lenke type 3 idiopathic scoliosis.The selection provides certain theoretical support and finite element data and provides a scientific reference for reducing surgical risk and long-term efficacy.