Accuracy of free-hand thoracic pedicle screw placement in severe idiopathic scoliosis via CT scan / 中南大学学报(医学版)

ABSTRACT

OBJECTIVE@#To analyze the accuracy of free-hand thoracic pedicle screw placement in severe idiopathic scoliosis via CT scan.@*METHODS@#Twenty patients with complete CT data were chosen out of 58 patients of severe idiopathic scoliosis from June 1996 to December 2006. The Cobb angle of the main thoracic curve was from 82 degree to 142 degree (96.3 degree +/- 14.3 degree). The kyphotic angle in the main curve was 66.2 degree +/- 12.4 degree. The placement of thoracic pedicle screw was completed free-handedly, and the accuracy of screws placement was evaluated with CT thin-slice scan postoperatively.@*RESULTS@#Altogether 174 thoracic pedicle screws were inserted, 157 (90.2%) of which were fully contained within the cortical boundaries of the pedicle.The other 17 screws (9.8%) were misplaced in 9 patients 11 screws (6.8%) were lateral, 9 of which had a breach 0.05). There was no neural complication in all patients.@*CONCLUSION@#It is fairly accurate place thoracic pedicle screw in severe idiopathic scoliosis free-handedly, with some misplacements.