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Table 3 Pedicle screw diameter and length

From: Size selection and placement of pedicle screws using robot-assisted versus fluoroscopy-guided techniques for thoracolumbar fractures: possible implications for the screw loosening rate

Variable

RAF

FGF

Statistic (χ2)

P value

No. of screws

 Total

136

144

5.309

0.379

 T10

2

6

  

 T11

22

20

  

 T12

36

34

  

 L1

32

38

  

 L2

34

28

  

 L3

10

18

  

Mean screw diameter (range), mm

 Total

6.04 (5.0–7.0)

5.78 (5.0–6.5)

− 3.067

0.000**

 T10

5.5 (5.5)

5.17 (5.0–5.5)

 T11

6.09 (5.5–7.0)

5.90 (5.5–6.5)

-0.975

0.330

 T12

6.11 (5.5–7.0)

6.04 (5.5–6.5)

-0.332

0.740

 L1

5.81 (5.0–6.5)

5.29 (5.0–6.0)

-4.281

0.000**

 L2

6.12 (5.5–7.0)

6.07 (5.5–6.5)

-0.238

0.812

 L3

6.20 (6.0–6.5)

5.94 (5.5–6.5)

-2.143

0.032*

Mean screw length (range), mm

 Total

50.45 (40–55)

48.63 (40–55)

-3.561

0.000**

 T10

50 (50)

48.54 (45–50)

 T11

50.00 (40–55)

49.50 (40–55)

− 0.320

0.749

 T12

49.19 (45–55)

47.35 (45–55)

2.064

0.039*

 L1

50.65 (40–55)

48.96 (40–55)

− 1.966

0.049*

 L2

51.18 (45–55)

49.34 (45–55)

− 1.391

0.164

 L3

53.00 (50–55)

48.33 (45–55)

− 3.144

0.020*

  1. RAF robot-assisted percutaneous pedicle screw fixation, FGF fluoroscopy-guided percutaneous pedicle screw fixation
  2. *P < 0.05; **P < 0.01, statistically significant