Abstract:

BACKGROUND: Nowadays there are so many screw place methods in lower cervical vertebra. But they have different accuracy. There was no comparative study on the pedicle screw internal fixation in lower cervical vertebra by three screw place methods such as vertebral plate partial resection screw place method, Abumi place screw method and pipeline dredge method.
OBJECTIVE: To explore the feasibility of the pedicle screw internal fixation in lower cervical vertebra (C3-7), and to compare the differences in screw satisfaction rate, blood loss, screw placing time, complications among vertebral plate partial resection screw place method, Abumi screw place method, and pipeline dredge method. 
METHODS: Totally 60 patients with lower cervical spine disease who needed the pedicle screw internal fixation through cervical posterior approach were chosen and divided into three groups each with 80 pedicle screws by vertebral plate partial resection place screw method (group A), Abumi screw place method (group B), and pipeline dredge method (group C). Intraoperative bleeding and time to place screw were calculated. The satisfaction rate and the constituent ratio in all sides of pedicle injury were observed before discharge. The incidence of lateral wall injury from C3 to C7 was compared.
RESULTS AND CONCLUSION: The time to place screw was progressively decreased in groups A, B and C (P < 0.05). There was no significant difference in the intraoperative bleeding and the constituent ratio among three groups (P > 0.05). The incidence of lateral wall injury in C4-5 was higher than that in C3, C6-7. It is indicated that pipeline dredge method is superior to vertebral plate partial resection screw place method and Abumi screw place method in posterior pedicle screw fixation.