Clinical estimate on pedicle screw placement in lower cervical spine assisted by spinal virtual surgery system

English Keywords:Spinal virtual surgery system  Multi-slice spiral CT  lower cervical pedicle  3D reconstruction  Accuracy

English Abstract:

  【Abstract】 Objectives: To evaluate the accuracy of pedicle screw placement in lower cervical spines assisted by spinal virtual surgery system(SVSS). Methods: 27 patients scheduled for lower cervical pedicle screw placement were divided into group A(SVSS 3D-assisted pedicle screw placement, n=10) and group B(MSCT 3D- assisted pedicle screw placement, n=17). All patients were examined by MSCT, and the data of group A were sent to SVSS, while the data of group B were sent to Silicon Graphics 02 Workstation. VR and MPR were used for reconstruction, which were used for individualized pedicle screw placement. MSCT scanning and 3D reconstruction was performed again to evaluate the accuracy of instrumentation. Richter perforation classification was used to evaluate screw perforation rate. Results: In group A, a total of 10 cases and 50 pedicle screws underwent MSCT scan after surgery, the rate of accuracy was 88％. According to the Richter perforation classification, a 10% was grade one, a 2% was grade two. In group B, a total of 17 cases and 76 pedicle screws underwent MSCT scan after surgery, the rate of accuracy was 88.16％. According to the Richter perforation classification, a 7.89% was grade one, and a 3.95% was grade two, no significant difference was noted between two groups(P＞0.05). Conciusions: SVSS can be used for individualized patient review and screw placement, and even for evaluation of prognosis as well as rehabilitation.