The evaluation of spiral CT scans on the safety of cervical anterior transpedicular screw fixation
JIANG Jian, CHEN , ZHAO , LIU Zhi-Li, YIN Qiang-Shui, SHU Yong, HUANG Shan-Hu
Chinese Journal of Clinical Anatomy ›› 2011, Vol. 29 ›› Issue (6) : 658-660.
The evaluation of spiral CT scans on the safety of cervical anterior transpedicular screw fixation
Objective To investigate the value of spiral CT on cervical anterior transpedicular screw insertion. Methods The cervical pedicle (C3~7) parameters for anterior transpedicular fixation from six cadaveric specimens were measured under CT scan and three dimensionally reconstructed. Cervical anterior transpedicular screws were implanted into cadaveric pedicles on the basis of the measured parameters. The position of cervical anterior transpedicular screws was evaluated by CT and reconstructing images, followed by the safety evaluation of screws insertion using Tomasino's method. Results In all of 60 pedicles (C3~7) measured, 4 was too small (the width of the pedicle<4.0 mm), and 1 was too closed to the upper plate, to be fixed. 55 screws were implanted successfully. Tomasino's evaluation demonstrated that, , Grade 1, 2 and 3 were 52, 2, and 1 screws in axial plane, and 52, 2, and 3 screws in saggital plane respectively. Conclusions Preoperative spiral CT scan is a valuable evaluation for safe insertion of cervical anterior transpedicular screw.
Cervical vetebrae / Anterior approach / Pedicle screw / Corpectomy / CT
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