Effect Analysis Of Pedicle Screw Placement For Thoracolumbar Fracture Assisted By Electromagnetic Navigation

Objective:By comparing the accuracy and the number of intraoperative fluoroscopy of thoracolumbar pedicle screw placement assisted by magnetic navigation and C-arm assisted thoracolumbar pedicle screw placement,the effect of the magnetic navigation system independently developed by Taishan Scholar Studio of Weihai Central Hospital in the operation of pedicle screw placement was evaluated.Methods:Spine specimens of the same segment were selected from 20 fresh commercial cattle,and congenital deformity and fracture were excluded by fluoroscopy.Expose the spinous process and preserve the perispinal tissue structure.CT scanning images,the backbones with special specimens fixed frame,according to the auxiliary nailing,20 specimens can be divided into two groups,group A(magnetic navigation group)in the magnetic navigation aids downward pedicle nailing,group B(group C arm)in the C arm auxiliary downward pedicle nailing,repeated again after the experiment respectively to the cow bone CT scanning images,nailing position can be divided into three: Ⅰ level,gram completely needle placement within the pedicle;Ⅱ level,gram needle worn out inner wall or outer wall,but not entirely in the pedicle,Ⅲ level,gram completely needle placed outside the pedicle.Ⅰ level for successful nailing,nailing Ⅱ Ⅲ level and the failure.In order to evaluate the accuracy of screw placement,the abduction Angle and head inclination of actual screw placement track and the preset screw placement track were compared before and after the experiment.Results: There were no significant differences in age,sex,body mass index and vertebral segment of bovine spinal model between groups before surgery(P<0.05).A total of 100 Kirschner wires were implanted in group A,including 99 Grade I screws,1 Grade II screws and 0 Grade III screws.The success rate of magnetic navigation group was 99.0%.A total of 100 Kirschner wires were implanted in group B,including 95 Grade I screws,4Grade II screws and 1 Grade III screws.The success rate of nail placement in the C-arm group was 95%.There was no significant statistical difference in the measured values of abaxial Angle and head tilt Angle between preoperative planned screw placement path and actual postoperative screw placement path between the two groups(P≥0.05).The difference between the magnetic navigation group and the C-arm group(P<0.001)showed significant statistical difference.The AS difference between the magnetic navigation group and the C-arm group was P<0.001,showing a statistically significant difference.There was no statistically significant difference in the time of screw placement between group A and group B,but there was statistically significant difference in the number of fluoroscopy between the two groups.Conclusion:1.The effect of the magnetic navigation assisted pedicle screw placement independently developed by the team is the same as that of the traditional C-arm assisted screw placement.2.The magnetic navigation-assisted pedicle screw placement independently developed by the team can effectively reduce intraoperative radiation exposure.