Table 3 The rate of screw perforation
From: A novel biplanar positioning technique to guide iliosacral screw insertion: a retrospective study
| Â | Grade 0 | Grade 1 | Grade 2 | P value |
|---|---|---|---|---|
Biplanar group | 94.1% | 0.59% | 0% | 0.008 |
 S1 | 17 | 1 | 0 | |
 S2 | 15 | 1 | 0 | |
Ti-Robot group | 97.2% | 2.8% | 0% | |
 S1 | 19 | 0 | 0 | |
 S2 | 16 | 1 | 0 | |
Traditional group | 75.7% | 15.2% | 9.1% | |
 S1 | 16 | 3 | 1 | |
 S2 | 9 | 2 | 2 |