Table 4 Radiation dose exposure and screw placement accuracy comparison

ED (mSv)

1.504 (0.494–4.406)

21.130 (10.840–30.390)

 < 0.001

Screw placement

Gertzbein–Robbins classification

502

450

 < 0.001

 A

390 (77.7)

417 (92.7)

 < 0.05*

 B

72 (14.3)

17 (3.7)

 < 0.05*

 C

18 (3.6)

12 (2.7)

ns

 D

6 (1.2)

4 (0.9)

ns

 E

16 (3.2)

0 (0.0)

 < 0.05*