Table 2.

Distribution of screw positions in the CT-navigation group

Level	Total screws	Correctly placed	Minor perforation <2 mm	Displaced
				2–<4 mm lateral	2–<4 mm medial	≥4 mm lateral	≥4 mm medial
Th1	8	2	4	2	0	0	0
Th2	11	8	3	0	0	0	0
Th3	17	12	3	0	0	2	0
Th4	38	19	10	5	2	1	1
Th5	42	31	1	5	3	1	1
Th6	51	30	13	6	2	0	0
Th7	66	44	12	8	0	1	1
Th8	55	36	6	10	2	0	1
Th9	54	42	10	2	0	0	0
Th10	56	48	4	2	0	2	0
Th11	158	138	14	6	0	0	0
Th12	218	177	33	4	1	3	0
Total thoracic screws	774	587	113	50	10	10	4
		700		74
L1	207	174	23	6	4	0	0
L2	280	230	41	4	1	2	2
L3	259	238	12	8	1	0	0
L4	363	312	36	10	1	4	0
L5	424	370	41	8	2	3	0
S1	115	106	6	0	3	0	0
Total lumbosacral screws	1,648	1,430	159	36	12	9	2
		1,589		59
Total screws	2,422	2,289		133