Table 2.
The difference in sagittal balance between the mismatch and the balance groups in the pre-operative state
| Pre-operation | Mismatch group | Balance group | Difference value (Δ) | p-value |
|---|---|---|---|---|
| Occipital slope (°) | 2.9±4.6 | 7.4±5.4 | 4.5 | <0.01 |
| C2 slope (°) | -19.1±4.6 | -5.8±6.5 | 13.3 | <0.01 |
| C7 slope (°) | -20.1±8.3 | -21.4±8.2 | -1.3 | 0.74 |
| T1 slope (°) | -23.9±7.3 | -23.6±8.1 | 0.6 | 0.20 |
| T1s-CL (°) | 23.0±5.7 | 7.6±6.9 | -15.4 | <0.01 |
| O-C2 angle (°) | 22.0±6.0 | 13.3±7.0 | -8.7 | <0.01 |
| C2-7 angle (°) | 1.0±9.4 | 15.7±10.1 | 14.7 | <0.01 |
| O-C7 angle (°) | 23.0±9.5 | 28.8±9.2 | 5.8 | <0.05 |
| Segmental slope, upper (°) | -18.4±5.8 | -13.0±5.8 | 5.4 | <0.01 |
| Segmental slope, lower (°) | -17.7±8.8 | -19.8±8.7 | -2.1 | 0.90 |
| Segmental angle (°) | -0.9±7.6 | 7.0±7.2 | 7.9 | <0.01 |
| Cranio-vertebral angle (°) | 59.5±4.2 | 62.0±16.6 | 2.5 | <0.01 |
| C2-7SVA (mm) | 26.2±9.6 | 15.6±8.9 | -11.6 | <0.01 |
Values are presented as mean±standard deviation or number. T1s-CL : T1 slope minus cervical lordosis, C2-7SVA : C2-7 sagittal vertical axis