Table 3.
Preoperative Radiological Parameters for the Coplanar (VCA) and Apical Derotation (AD) Groups.
| Preop | ||||
|---|---|---|---|---|
| VCA mean ± SD | AD mean ± SD | p value* | ||
| Major Curve | Coronal Cobb** | 64.8±24.6 | 66.8±26.9 | 0.758 |
| Max Bending | 60.7±27.3 | 51.3±29.1 | 0.346 | |
| Bending Flexibility | 6.6±18.5 (7%) |
16.1±12.7 (29%) |
0.076 | |
| Max Traction | 54.1±25.3 | 47.2±27.0 | 0.455 | |
| Traction Flexibility | 18.4±13.6 (26%) |
19.4±11.7 (33%) |
0.828 | |
| Max Rotation | 19.2±13.7 | 18.6±11.2 | 0.878 | |
| Pelvic Obliquity | 7.7±9.4 | 12.5±21.1 | 0.879 | |
| Sagittal profile | Thoracic Kyphosis | 37.3±28.5 | 45.6±28.4 | 0.290 |
| Lumbar Lordosis | 56.4±19.7 | 52.5±20.2 | 0.472 | |
| Sacral Slope | 33.9±9.1 | 39.2±10.5 | 0.050 | |
| Pelvic Incidence | 46.2±11.5 | 57.3±18.5 | 0.008 | |
| Pelvic Tilt | 13.2±9.9 | 16.2±12.9 | 0.390 | |
| SVA | 29.4±34.2 | 23.1±45.2 | 0.592 | |
| T9Spi | 11.8±10.3 | 11.1±12.1 | 0.834 | |
| T1Spi | 2.7±6.1 | 1.3±7.0 | 0.444 | |
*unpaired t-test **Cobb: Highest magnitude curve, Max Rotation: Apical vertebral rotation for the curve with the biggest magnitude, Max Bending and MaxTraction: Dynamic measures for the biggest curve magnitude, used to determine curve flexibility.
VCA indicates vertebral coplanar alignment; AD, apical derotation.