Table 4. Radiographic changes for patients who underwent a revision surgery at some post-operative time point.
| Radiographic factor | Pre-operative | 1-year post-operative | Change | P value |
|---|---|---|---|---|
| Pelvic tilt (°) | 21.59±16.07 | 18.07±8.65 | −3.52±9.84 | 0.263 |
| Pelvic incidence (°) | 56.28±11.10 | 56.55±9.86 | 0.27±2.41 | 0.722 |
| PI-LL (°) | −1.59±19.37 | −6.33±11.76 | −4.74±13.18 | 0.260 |
| T4-T12 thoracic kyphosis (°) | −42.79±12.19 | −49.42±10.26 | −5.19±10.31 | 0.146 |
| T1 slope (°) | 34.05±13.41 | 41.50±11.66 | 6.52±9.90 | 0.083 |
| TS-CL (°) | 39.55±23.84 | 35.36±18.2 | 1.53±24.39 | 0.855 |
| C2–C7 lordosis (°) | −5.50±28.26 | 6.14±15.12 | 4.99±26.55 | 0.588 |
| cSVA (mm) | 57.44±16.22 | 51.76±16.72 | −4.49±24.96 | 0.604 |
| C2–T3 angle (°) | −21.04±23.94 | −8.70±19.43 | 7.24±37.09 | 0.574 |
| C2–T3 SVA (mm) | 93.44±27.77 | 94.75±25.51 | 1.08±28.47 | 0.912 |
| C2 slope (°) | 40.91±24.81 | 35.60±19.53 | 0.32±27.98 | 0.973 |
| SVA (mm) | −31.85±60.76 | −11.97±90.85 | 28.49±80.14 | 0.317 |
PI-LL, pelvic incidence minus lumbar lordosis; TS-CL, T1 slope minus cervical lordosis; cSVA, cervical sagittal vertical axis; SVA, sagittal vertical axis.