Table 4 Instrumented levels and risks for proximal facet joint violation

14

1

0

1

14 (4.2)

2 (0.6)

0.459 (0.102–2.066)

0.462

40

3

0

1

40 (12.0)

4 (1.2)

0.295 (0.102–0.851)

0.029

45

5

3

1

45 (13.6)

9 (2.7)

0.618 (0.287–1.329)

0.214

36

4

2

2

36 (10.8)

8 (2.4)

0.705 (0.313–1.589)

0.398

15

3

0

2

15 (4.5)

5 (1.5)

1.111 (0.390–3.162)

0.843

42

8

4

6

42 (12.7)

18 (5.4)

1.547 (0.830–2.885)

0.168

41

10

11

8

41 (12.3)

29 (8.7)

3.153 (1.785–5.572)

< 0.001

22

0

2

0

22 (6.6)

2 (0.6)

0.282 (0.065–1.229)

0.124

255

34

22

21

255 (76.8)

77 (23.2)

–

–