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Table 2 The effect of lumbar level and screw size on three complications

From: Risk of pedicle and spinous process violation during cortical bone trajectory screw placement in the lumbar spine

Complication

Size (mm)

L1

L2

L3

L4

L5

p valuea

A (%)

4.5

68.3

53.3

25.5

1.7

0

< 0.001

5.0

70.5

53.8

26.7

1.7

0

< 0.001

5.5

71.1

54.4

27.2

1.7

0

< 0.001

p valueb

0.831

0.971

0.936

1.000

–

 

B (%)

4.5

16.7

12.7

2.8

1.1

6.7

< 0.001

5.0

25.5

26.1

12.7

3.3

11.7

< 0.001

5.5

35.5

34.4

23.8

6.7

16.7

< 0.001

p valueb

< 0.001

< 0.001

< 0.001

0.019

0.013

 

C (%)

4.5

3.9

1.1

0

0

0

< 0.001

5.0

6.7

2.2

0

0

0

< 0.001

5.5

14.4

7.8

2.8

0

0

< 0.001

p valueb

0.001

0.002

0.018

–

–

 
  1. A Spinous process violation, B Screw penetration through the inner wall of pedicle, C Screw penetration through the outer wall of pedicle, L Lumbar
  2. a Comparison among lumbar levels
  3. b Comparisons among screw sizes
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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