Table 2.
Relationship of radiological parameters and S1 screw loosening
| S1 screw non-loosening group | S1 screw loosening group | P value | |
|---|---|---|---|
| Cobb angle (°) | |||
| Preoperative | 27.8 ± 13.2 | 28.7 ± 12.1 | 0.759 |
| Soon after surgery | 11.3 ± 7.3 | 10.2 ± 5.9 | 0.460 |
| Change | −16.5 ± 8.4 | −18.5 ± 8.7 | 0.298 |
| Final | 11.4 ± 6.3 | 10.3 ± 5.2 | 0.392 |
| Sagittal vertical axis (mm) | |||
| Preoperative | 43.7 ± 44.4 | 47.2 ± 51.1 | 0.745 |
| Soon after surgery | 25.0 ± 34.2 | 14.4 ± 41.0 | 0.252 |
| Change | −21.2 ± 57.3 | −31.8 ± 57.7 | 0.456 |
| Final | 46.7 ± 35 | 54.2 ± 38.2 | 0.392 |
| PT (°) | |||
| Preoperative | 22.4 ± 11.8 | 24.1 ± 10.5 | 0.533 |
| Soon after surgery | 17.5 ± 10.3 | 17.3 ± 8.3 | 0.923 |
| Change | −4.4 ± 10.1 | −6.8 ± 7.7 | 0.265 |
| Final | 21.7 ± 10.2 | 22.6 ± 9.5 | 0.696 |
| LL(°) | |||
| Preoperative | 26.4 ± 15.0 | 23.0 ± 15.1 | 0.334 |
| Soon after surgery | 37.7 ± 10.0 | 36.5 ± 11.0 | 0.619 |
| Change | 11.3 ± 13.4 | 13.5 ± 13.3 | 0.482 |
| Final | 31.9 ± 10.1 | 30.1 ± 12.7 | 0.502 |
| Preoperative PI-LL (°) | 20.3 ± 16.4 | 23.8 ± 17.4 | 0.372 |
| TPA | |||
| Preoperative | 20.2 ± 11.8 | 22.0 ± 11.5 | 0.503 |
| Soon after surgery | 13.5 ± 8.4 | 12.6 ± 7.9 | 0.638 |
| Change | −6.2 ± 9.8 | −9.5 ± 8.2 | 0.145 |
| Final | 20.1 ± 10.4 | 21.3 ± 9.2 | 0.599 |
| Blood loss (ml) | 1244.4 ± 709.9 | 1294.1 ± 946.5 | 0.798 |
| Operative time (min) | 278.4 ± 55.2 | 277.7 ± 63.5 | 0.960 |
| Average hospitalization (days) | 13.1 ± 6.8 | 14.6 ± 9.0 | 0.425 |
| ODI score | 27.2 ± 21.6 | 31.6 ± 18.9 | 0.366 |