Table 2.
Associations with S1 iliosacral screw breach.
| n = 121 screws | Breach (n = 40) | No breach, (n = 79) | Difference, 95% Confidence Interval | P-value |
|---|---|---|---|---|
| Age | 41 (28–53) | 42 (27–54) | −1, −7 to 5 | 0.7 |
| Female gender | 14 (33%) | 28 (35%) | −2%, −19 to 16% | 0.8 |
| BMI | 26 (22–29) | 26 (22–29) | −0.2, −2 to 2 | 0.8 |
| Tile C injury | 24 (57%) | 33 (42%) | 15%, −3 to 33% | 0.1 |
| S1-IS axial corridor width (mm) | 15 (14–17) | 16 (14–18) | −1, −2 to 1 | 0.3 |
| S1-IS coronal corridor width (mm) | 14 (13–15) | 14 (13–15) | 0, −1 to 1 | 0.5 |
| Axial or coronal S1-TS corridor < 10 mm | 24 (60%) | 41 (51%) | 9%, −8 to 24% | 0.1 |
| True S1 alar angle (degree) | 29 (1–44) | 28 (0–36) | 1, −0.6 to 5 | 0.1 |
| 2 screws in same corridor | 17 (43%) | 23 (28%) | 14%, −3 to 32% | 0.1 |
Continuous variables are presented as median (interquartile interval).
(IS – Iliosacral, TS – transsacral).