Table 3.

Summary of accuracy of spinal instruments using pedicle screw, lateral mass screw, or laminar screws

Grade	No.	%	Spine level			Type of misplacement
			Cervical	Thoracic	Lumbar	Medial	Lateral
0	399	95.2
1	13	3.1	5	6	2	2	11
2	7	1.7	3	4			7
3	0	0