Objective:To discuss the practical applicability and security of the thoracic pedicle screw placement by using the funnel technique for the surgery of Adolescent idiopathic scoliosis(AIS).Methods:The operations of inserting thoracic pedicle screws by using the funnel technique were performed on 21 patients with AIS.Placement process and perioperative complications were rviewed.Low accuracy screws implantation were scaned by 3D-C-arm X ray intraoperatively to determine the screw position corial perforation number and distance.The position of screw placement was evaluated with X-ray in all patients at early stage.Results:A total of 268 thoracic pedicle screws were inserted by the funnel technique

39 screws of low accuracy placement screws were scaned by 3D-C-arm in which none to penetrate the medialis or lateral cortical wall of the pedicles and 3 screws(7.69%) violated the vertebral anterior wall.All patients were observed by X-ray picture after the operation and the positions of the pedicle screws were satisfactory

No neurovascular complications or cerebrospinal leakage were found.Conclusion:The method of thoracic pedicle screws placement by the funnel technique is safe and applicable.