Table 1.
Curve characteristics and distribution of pedicle screws
| Type of curves | N (%) |
|---|---|
| Right convex thoracic curve | 34 (69.4) |
| S-formed double curves | 10 (20.4) |
| Left convex thoracic curve | 2 (4.1) |
| Left convex lumbar curve | 3 (6.1) |
| Scoliotic apex (major curve) | |
| T8 or T9 | 43 (87.8) |
| L2 | 3 (6.1) |
| T12 | 2 (4.1) |
| T5 | 1 (2) |
| Distribution of screws | |
| Thoracic | 688 (78.9) |
| Lumbar | 185 (21.1) |
| Distribution of thoracic screws | |
| T1–T6 | 273 (31.2) |
| T7–T10 (at or around scoliotic apex) | 273 (31.2) |
| T11–T13 | 142 (16.5) |
| Cobb angle | |
| Whole study population | 55.1 ± 10.4° (55.5°)* |
| Patients with no misplacement | 54.7 ± 10.4° (55.3°)* |
| Patients with screw misplacement | 56.7 ± 10.3° (57°)*, P = 0.037 |
| The degree of vertebral rotation | |
| Whole study population | 19.8 ± 6.9° (18°)* |
| Patients with no misplacement | 19.7 ± 6.9° (18°)* |
| Patients with screw misplacement | 20.1 ± 6.4° (18°)*, P = 0.438 |
* Mean ± SD (median)