Analysis of errors of computer-assisted cervical pedicle screw installation / 中国矫形外科杂志

ABSTRACT

[Objective]To evaluate the accuracy of computer-assisted cervical pedicle screw installation and discuss the reasons of screw malposition.[Method]Totally 144 cervical pedicle screws were installed by computer-assisted navigation in 25 patients with lower cervical spinal disease.All the patients were examined by X-rays and CT after operation.Screw position and direction were measured on the sagittal and transsection image of intraoperative navigation and post-operative CT.The result was analyzed statistically.[Result]Two screws perforated the upper pedicle wall,3 deviated from the lateral pedicle wal1.There was no statistical difference in screw position or direction between navigation and CT image.Navigational images were based on the principle of rigid tissue.[Conclusion]Computer-assisted navigation can improve the accuracy of cervical pedicle screw installation.Screw malposition is responsible for the excursion phenomenon.