Table 7.
Difference of Patients’ Radiological Evaluations Classified by Increase of SVA.
| SVA Increase <40 mm | SVA Increase ≥40 mm | P | |
|---|---|---|---|
| Number | 18 | 5 | |
| PI | |||
| Preoperative | 50.6 ± 8.0 | 52.4 ± 7.4 | .66 |
| Postoperative | 50.3 ± 8.6 | 53.0 ± 9.4 | .55 |
| Last follow-up | 51.7 ± 8.2 | 51.6 ± 9.6 | .98 |
| PT | |||
| Preoperative | 36.5 ± 10.5 | 41.0 ± 9.9 | .48 |
| Postoperative | 23.7 ± 6.0 | 27.0 ± 14.3 | .45 |
| Last follow-up | 26.2 ± 8.0 | 27.4 ± 18.2 | .83 |
| LL | |||
| Preoperative | 12.7 ± 19.7 | –3.5 ± 21.0 | .13 |
| Postoperative | 41.0 ± 7.8 | 31.4 ± 12.6 | .04 |
| Last follow-up | 41.1 ± 9.1 | 25.0 ± 17.1 | <.01 |
| TK | |||
| Preoperative | 31.7 ± 15.5 | 20.0 ± 13.2 | .13 |
| Postoperative | 36.9 ± 10.7 | 29.6 ± 4.3 | .15 |
| Last follow-up | 45.6 ± 13.6 | 35.5 ± 13.0 | .08 |
| PI-LL | |||
| Preoperative | 37.9 ± 20.1 | 57.8 ± 22.8 | .07 |
| Postoperative | 9.3 ± 7.9 | 21.6 ± 16.3 | .03 |
| Last follow-up | 10.6 ± 8.4 | 30.0 ± 26.2 | .01 |
| SVA | |||
| Preoperative | 128.4 ± 52.1 | 169.6 ± 66.9 | .16 |
| Postoperative | 44.1 ± 28.7 | 79.0 ± 66.8 | .09 |
| Last follow-up | 50.2 ± 29.4 | 151.8 ± 75.7 | <.01 |
| C7-CSVL | |||
| Preoperative | 36.7 ± 30.3 | 30.2 ± 15.0 | .65 |
| Postoperative | 17.4 ± 6.3 | 22.6 ± 16.3 | .66 |
| Last follow-up | 22.6 ± 16.3 | 9.6 ± 6.9 | .10 |
| Loosening of S2 alar screw | +10, −8 | +3, −2 | .86 |
| L5-S1 angle | |||
| Preoperative | 9.3 ± 7.8 | 8.2 ± 2.9 | .76 |
| Postoperative | 7.4 ± 3.7 | 7.9 ± 5.1 | .80 |
| Last follow-up | 6.7 ± 3.9 | 1.5 ± 7.2 | .04 |
Abbreviations: SVA, sagittal vertical axis; PI, pelvic incidence; PT, pelvic tilt; LL, lumbar lordosis; TK, thoracic kyphosis; CSVL, central sacral vertical line.
Boldface indicates significant difference with P value < .05.