Table 2.
A summary of the pedicle screw length, angle, and diameter
| Spinal level | Average screw angle (range) (°) | 95% CI (°) | Average screw length (mm) (range) | 95% CI | Average screw diameter (mm) (range) | 95% CI |
|---|---|---|---|---|---|---|
| L1 | 21.3 (13.4-27.7) | 19.8-22.9 | 45.2 (35-55) | 42.7-47.8 | 5.5 (4.5-7.5) | 5.1-5.9 |
| L2 | 21.3 (16.2-27.7) | 20.4-22.2 | 46.8 (40-55) | 45.0-48.5 | 5.3 (4.5-6.5) | 5.1-5.6 |
| L3 | 23.4 (16.2-29.9) | 22.6-24.3 | 46.6 (40-55) | 45.2-48.0 | 5.9 (4.5-8.5) | 5.5-6.2 |
| L4 | 26.6 (20.3-36.6) | 25.7-27.5 | 45.3 (35-50) | 43.9-46.5 | 5.8 (4.5-7.5) | 5.5-6.1 |
| L5 | 34.1 (23.1-43.9) | 32.6-35.6 | 45.3 (35-55) | 43.8-46.7 | 6.7 (4.5-9.5) | 6.2-7.2 |
| S1 | 36.3 (23.6-45.6) | 34.6-37.9 | 46.8 (35-55) | 45.4-48.3 | 7.8 (4.5-9.5) | 7.4-8.2 |
CI – Confidence interval