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Table 2 Distribution of correctly inserted screws versus violated according to the region of spinal fixation

From: Postoperative 320 multi-slice computed tomography in assessment of pedicle screw insertion in thoraco-lumbar fixation

Screw Placement

Fixation region

Total

n (%)

Thoracic

Lumbo-sacral

T9

T10

T11

T12

total

L1

L2

L3

L4

L5

S1

Total

Correct

7

10

12

19

48

16

20

33

72

71

26

238

286 (84.12)

Violation

3

4

8

7

22

4

6

7

10

3

2

32

54 (15.88)

Total

10

14

20

26

70

20

26

40

82

74

28

270

340 (100)

Incidence rate of violation

30

28.6

40

26.9

31.4

20

23.1

17.5

12.2

4.1

7.1

11.9

15.9

P value

0.00007***

χ2

15.94

  1. *** highly significant
  2. χ2 chi-square