Skip to main content

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