Demographic data compared between the kyphosis progression and stable groups.
| Associated Factors | Kyphosis Progression Group (n = 32) | Stable Group (n = 59) | P Value |
| Age, y, mean ± SD | 43.56 ±15.5 | 42.92 ±11.5 | 0.821 |
| >60 y, n (%) | 5 (15.6%) | 4 (6.8%) | 0.269 |
| Gender, n (%) | |||
| Male | 23 (71.8%) | 36 (61.2%) | 0.362 |
| Female | 9 (28.2%) | 23 (38%) | |
| Body mass index, mean ± SD | 23.24 (±3.4) | 22.63 (±3.3) | 0.403 |
| >25, n (%) | 9 (28.1%) | 14 (23.7%) | 0.801 |
| Fracture level, n (%) | |||
| T11 | 0 | 1 (1.7%) | 0.711 |
| T12 | 6 (18.8%) | 16 (27.1%) | |
| L1 | 16 (50.0%) | 29 (49.2%) | |
| L2 | 10 (31.2%) | 13 (22.0%) | |
| AO spine Thoracolumbar injuries system, n (%) | |||
| B1/B2 | 1 (3.0%) | 5 (8.5%) | 0.326 |
| A2 | 3 (9.4%) | 6 (10.2%) | |
| A3 | 14 (43.8%) | 33 (55.9%) | |
| A4 | 14 (43.8%) | 15 (25.4%) | |
| Posterior ligamentous complex injuries, n (%) | 20 (62.5%) | 27 (45.8%) | 0.187 |
| Thoracolumbar injury classification and severity score, mean ± SD | 4.69 ± 0.64 | 4.62 ± 0.87 | 0.399 |
| Initial kyphotic angle, mean ± SD | 15.41 ± 9.9 | 15.08 ± 8.3 | 0.869 |
| Postoperative kyphotic angle, mean ± SD | 3.72 ± 8.0 | 4.36 ± 7.4 | 0.705 |
| Loss correction angle, mean ± SD | 9.47 ± 3.6 | 2.29 ± 1.7 | <0.001 |
| Intermediate screw, n (%) | 29 (90.6%) | 54 (91.5%) | 1.000 |
| Surgical technique, n (%) | |||
| Open technique | 10 (31.3%) | 17 (28.8%) | 0.814 |
| Minimally invasive technique | 22 (68.7%) | 42 (71.2%) | |
| Follow-up time, mean ± SD | 21.98 ± 10.3 | 26.76 ± 9.9 | 0.031 |
| Load-sharing classification | |||
| Comminution | |||
| 1 | 9 (28.1%) | 18 (30.5%) | 0.569 |
| 2 | 12 (37.5%) | 27 (45.8%) | |
| 3 | 11 (34.4%) | 14 (23.7%) | |
| Apposition | |||
| 1 | 11 (34.4%) | 23 (39.0%) | 0.769 |
| 2 | 14 (43.8%) | 27 (45.8%) | |
| 3 | 7 (21.8%) | 9 (15.2%) | |
| Reduction | |||
| 1 | 3 (9.4%) | 6 (10.2%) | 0.466 |
| 2 | 8 (25%) | 22 (37.3%) | |
| 3 | 21 (65.6%) | 31 (52.5%) | |
| Total score >6 | 17 (53.1%) | 22 (37.3%) | 0.185 |