Table 2. Pedicular screw evaluation.

Technique	Total screws	Correctly placed	Minor perforation <2 mm	Displaced with potential clinical risk
				2 to <4 mm (lat–sup)	2 to ≤4 mm (med–inf)	≥4 m (lat–sup)	≥4 m (med–inf)
Fluoroscopy	234	200	26	2	3	1	2
Navigation	576	548	24	4	0	0	0

lat, lateral; sup, superior; med, medial; inf, inferior.