Biomechanical Finite Element Analysis Of The Treatment Of Lenke2 Adolescent Idiopathic Scoliosis With Key Screw Placement And Continuous Pedicle Screw Placement

ObjectiveIn this study,we used finite element method to evaluate the corrective effect and biomechanical changes of Lenke2 severe adolescent idiopathic scoliosis patients under two surgical programs of key screw placement and continuous pedicle screw placement.The aim of this study is to find a surgical procedure that can reduce the risk and cost of screw placement while maintaining a reasonable 3D orthopedic effect.To provide theoretical basis for surgical treatment of Lenke2 adolescent idiopathic scoliosis.MethodsIn this study,a 13-year-old adolescent patient was selected as the experimental object,relevant CT image data of the patient was collected,and the finite element model of adolescent idiopathic scoliosis was constructed by using CT three-dimensional entity reconstruction,reverse engineering,grid construction and other computer-assisted techniques.Finally,a three-dimensional finite element model was established to analyze the overall corrective effect and stress distribution under the two surgical methods.ResultsThe main results are as follows:(1)Two finite element models of Lenke2 type idiopathic scoliosis surgery were successfully established.(2)The correction rates of thoracic vertebra main curvature were 49.1%,47.0%,thoracic vertebra secondary curvature was 57.8%,55.30%.There was no significant difference in the rate of correction between the two groups.The angle of thoracic kyphosis and the angle between the perpendicular line and the median line of parietal vertebra decreased to varying degrees.The maximum stress of the continuous pedicle screw was located on the right side of T6,with a stress value of 236.47 MPa.The maximum stress of the key screw was located on the left side of T8,with a stress value of201.20 MPa,less than the maximum stress value of continuous pedicle screw.Both of them will not cause screw fracture and deformation.ConclusionThe finite element model of Lenke2 severe idiopathic scoliosis was successfully established by using finite element method.For patients,the key screw placement technique also has good orthopedic effect.Therefore,surgical intervention can be carried out in advance to ensure the corrective effect of the patients with AIS,and the key screw placement technique can be used to reduce the use of implants,reduce surgical trauma and economic burden,providing a basis for the surgical treatment of patients with this type of scoliosis in the future clinical work.