Table 2.
Screw-related variables
| Variables | N = 488 |
|---|---|
| Pedicle | |
| Level | |
| L2 | 12 (2.5%) |
| L3 | 44 (9.0%) |
| L4 | 164 (33.6%) |
| L5 | 188 (38.5%) |
| S1 | 80 (16.4%) |
| Width (mm) | 15.17 ± 4.01 |
| Height (mm) | 12.37 ± 1.75 |
| Convergent angle (°) | 26.9 ± 5.6 |
| Facet joint osteoathritis | |
| Normal | 64 (13.1%) |
| Mild | 90 (18.4%) |
| Moderate | 208 (42.6%) |
| Severe | 126 (25.8%) |
| Screw | |
| Length | |
| 35 mm | 4 (0.8%) |
| 40 mm | 82 (16.8%) |
| 45 mm | 402 (82.4%) |
| Diameter | |
| 5.5 mm | 15 (1.4%) |
| 6.5 mm | 473 (98.5%) |
| Trajectory angle (°) | 23.9 ± 5.3 |
Values are expressed as the number (%) for categorical variables, and as the mean ± standard deviation for continuous variables