Gardner angle change over time.
| Patient No. | Treatment Type | Initial (°) | 1 y (°) | P Value | Change (°) |
| 4 | Short segment | 17.3 ± 4.7 | 24.1 ± 5.1 | 0.099 | −6.8 |
| 28 | Multilevel | 16.8 ± 9.4 | 14.2 ± 8.3 | 0.28 | 2.6 |
| 12 | Corpectomy | 22.3 ± 7.0 | 11.3 ± 9.5 | 0.004 | 11.0 |
| 5 | Delayed | 14.8 ± 7.5 | 23.3 ± 13.2 | 0.26 | −8.5 |
| 117 | Nonsurgical | 13.9 ± 7.9 | 21.9 ± 8.3 | <0.001 | −8.1 |