Table 9.
Difference of Patients’ Radiological Evaluations Classified by Loosening of S2 Alar Screw.
| Loosening − | Loosening + | P | |
|---|---|---|---|
| Number | 10 | 13 | |
| PI | |||
| Preoperative | 50.5 ± 8.4 | 51.5 ± 7.8 | .78 |
| Postoperative | 50.4 ± 9.4 | 51.3 ± 8.3 | .81 |
| Last follow-up | 50.8 ± 8.6 | 52.4 ± 8.1 | .66 |
| PT | |||
| Preoperative | 36.0 ± 10.5 | 38.3 ± 10.8 | .62 |
| Postoperative | 24.3 ± 9.0 | 24.5 ± 7.8 | .95 |
| Last follow-up | 23.6 ± 12.8 | 28.7 ± 8.2 | .26 |
| LL | |||
| Preoperative | 10.1 ± 21.1 | 9.4 ± 20.8 | .94 |
| Postoperative | 40.2 ± 7.8 | 37.9 ± 20.0 | .58 |
| Last follow-up | 38.8 ± 12.7 | 37.8 ± 13.3 | .95 |
| TK | |||
| Preoperative | 24.3 ± 12.5 | 32.1 ± 17.6 | .25 |
| Postoperative | 34.2 ± 7.2 | 36.2 ± 12.1 | .64 |
| Last follow-up | 37.7 ± 6.9 | 41.8 ± 17.7 | .49 |
| PI-LL | |||
| Preoperative | 40.4 ± 24.4 | 42.1 ± 20.7 | .86 |
| Postoperative | 10.2 ± 12.0 | 13.4 ± 10.7 | .51 |
| Last follow-up | 13.4 ± 14.6 | 12.0 ± 9.7 | .79 |
| SVA | |||
| Preoperative | 126.0 ± 58.4 | 140.3 ± 54.3 | .56 |
| Postoperative | 36.1 ± 35.0 | 63.6 ± 42.2 | .11 |
| Last follow-up | 68.0 ± 44.6 | 72.5 ± 70.1 | .86 |
| C7-CSVL | |||
| Preoperative | 25.3 ± 18.8 | 43.3 ± 32.7 | .14 |
| Postoperative | 19.0 ± 11.6 | 19.8 ± 12.3 | .87 |
| Last follow-up | 22.1 ± 18.4 | 16.7 ± 11.1 | .42 |
| L5-S1 angle | |||
| Preoperative | 8.7 ± 7.7 | 9.3 ± 6.6 | .83 |
| Postoperative | 7.1 ± 4.1 | 7.8 ± 3.9 | .64 |
| Last follow-up | 5.9 ± 5.5 | 5.4 ± 5.0 | .83 |
Abbreviations: PI, pelvic incidence; PT, pelvic tilt; LL, lumbar lordosis; TK, thoracic kyphosis; SVA, sagittal vertical axis; CSVL, central sacral vertical line.