Table 3.
Associations with S1 transsacral screw breach.
| n = 55 screws | Breach (n = 24) | No breach, (n = 31) | Difference, 95% Confidence Interval | P-value |
|---|---|---|---|---|
| Age | 47 (31–61) | 36 (24–58) | 6, −3 to 19 | 0.1 |
| Female gender | 10 (42%) | 8 (26%) | 16%, −9 to 39% | 0.2 |
| BMI | 24 (22–28) | 25 (23–27) | −0.6, −3 to 2 | 0.7 |
| Tile C injury | 12 (50%) | 14 (45%) | 5%, −21 to 30% | 0.7 |
| S1-TS axial corridor width (mm) | 15 (12–18) | 16 (14–18) | −1, −3 to 1 | 0.2 |
| S1-TS coronal corridor width (mm) | 15 (13–16) | 14 (13–17) | 0, −2 to 2 | 0.9 |
| Axial or coronal S1-TS corridor < 10 mm | 3 (13%) | 3 (10%) | 3%, −14 to 21% | 0.3 |
| 2 screws in same corridor | 8 (33%) | 4 (13%) | 20%, −3 to 41% | 0.1 |
Continuous variables are presented as median (interquartile interval).
(TS – transsacral).