Comparison of angular correction and loss of correction between open and PPI in all patients and selected patient subgroups.
| Variable | Angular Correctiona
(°) | P Valueb | Loss of Correctionc (°) | P Valueb |
| All patients | ||||
| Open, mean ± SD (95% CI) | 11 ± 9 (9–13) | 0.81 | 1 ± 2 (0–2) | 0.82 |
| PPI | 11 ± 10 (6–15) | 1 ± 3 (0–2) | ||
| Overweight and obese patients only | ||||
| Open | 9 ± 8 (6–12) | 0.44 | 1 ± 3 (0–2) | 0.74 |
| PPI | 7 ± 8 (2–11) | 1 ± 3 (−1 to 3) | ||
| Thoracolumbar (T10-L2) fractures only | ||||
| Open | 15 ± 8 (12–18) | 0.25 | 1 ± 2 (0–2) | 0.85 |
| PPI | 12 ± 10 (7–16) | 1 ± 3 (0–2) | ||
| AO type A compression fractures onlyd | ||||
| Open | 8 ± 10 (3–13) | 0.66 | 1 ± 3 (0–3) | 0.92 |
| PPI | 7 ± 8 (2–12) | 2 ± 3 (−1 to 4) | ||
| AO type B tension-band injuries only | ||||
| Open | 12 ± 17 (9–15) | 0.29 | 1 ± 3 (0–3) | 0.38 |
| PPI | 16 ± 10 (9–22) | 0 ± 2 (−1 to 2) | ||
| AO type A and B combined | ||||
| Open | 10 ± 9 (8–13) | 0.86 | 1 ± 3 (0–2) | 0.78 |
| PPI | 11 ± 10 (7–15) | 1 ± 3 (0–2) | ||
Abbreviation: PPI, percutaneous pedicle instrumentation.
↵a Angular correction is the differences between preoperative and immediate postoperative radiograph Cobb angle.
↵b Indicates statistically significant values with P < 0.05.
↵c Loss of correction is the difference between immediate postoperative and last follow-up radiograph Cobb angle.
↵d Adapted from: Vaccaro AR, et al. AOSpine thoracolumbar spine injury classification system: fracture description, neurological status, and key modifiers. Spine (Phila Pa 1976). 2013;38(23):2028–2037.