Table 3.
Descriptive analysis of spino-pelvic and global alignment parameters in AIS patients pre- and post-operatively
| Pre-OP | Post-OP | Change = Δ | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Parameter | Min | Max | Mean | SD | Min | Max | Mean | SD | Min | Max | Mean | SD |
| SS | 6.1 | 62.2 | 40.5 | 10.5 | 12.0 | 72.6 | 40.9 | 11.2 | −12.5 | 17.9 | 0.4 | 6.8 |
| PT | −6.0 | 30.5 | 12.2 | 8.1 | −17.7 | 30.5 | 11.7 | 9.0 | −16.4 | 10.9 | −0.5 | 6.5 |
| PI | 15.2 | 82.9 | 52.6 | 13.7 | 16.0 | 81.8 | 52.5 | 13.4 | −4.8 | 4.3 | −0.1 | 1.9 |
| PI-LL | −41.2 | 29.8 | −4.9 | 12.8 | −34.5 | 27.2 | −4.3 | 13.2 | −21.5 | 25.3 | 0.6 | 10.6 |
| LL (L1-S1) | 20.0 | 91.7 | 57.5 | 12.9 | 21.7 | 87.2 | 56.8 | 13.6 | − 25.9 | 22.8 | −0.7 | 10.4 |
| TK (T2-T12) | −91.2 | 17.5 | −36.7 | 17.0 | − 93.6 | −5.2 | −33.1 | 13.8 | −30.9 | 49.8 | −1.1 | 14.3 |
| SVA | − 111.6 | 143.5 | 1.2 | 46.4 | −98.6 | 168.2 | −0.6 | 45.5 | − 140.4 | 172.9 | −1.8 | 49.3 |
| T1SPI | −11.7 | 7.4 | −4.2 | 4.3 | −15.4 | 6.5 | −4.3 | 4.0 | −15.1 | 12.5 | −0.1 | 4.6 |
| TPA | −9.3 | 28.3 | 8.0 | 7.4 | −16.9 | 27.2 | 7.4 | 8.8 | −15.5 | 14.3 | −0.6 | 6.2 |
SS sacral slope, PT pelvic tilt, PI Pelvic incidence, LL (L1 – S1) lumbar lordosis measured from L1 to S1, PI-LL pelvic incidence minus lumbar lordosis mismatch, TK (TK 2 – TK 12) thoracic kyphosis measured from TK 2 to TK 12, SVA sagittal vertical axis, T1SPi T1 spinopelvic inclination, TPA T1 pelvic angle; cranial, MGS McGregor Slope (line), Δ parameter change pre- to post-operatively, SD standard deviation