Table 6.

Complications related to posterior cervical screw fixation in four studies

	Present study	Abumi [1]	Kamimura [8]	Heller [5]
Type of screws	Pedicle	Pedicle	Pedicle	Lateral mass
No. of patients	26	180	9	78
No. of screws	94	712	36	654
Compression or injury of neural structures	2	2	0	6
Vascular complications	0	1	0	0
Mechanical complications	0	0	0	3
Infection	0	2	0	1
Total	2 (7.6%)	5 (2.7%)	0 (0%)	10 (12.8%)
No. of revision surgery	1 (3.8%)	2 (1.1%)	0 (0%)	8 (10.3%)