Comparison of radiographic parameters after revision surgery.
| Radiographic Parameters | No R-PJF (N = 36) | R-PJF (N = 24) | P |
| After revision surgery | |||
| LL (°) | 39.2 ± 13.8 | 34.9 ± 14.2 | 0.244 |
| Pelvic incidence–LL (°) | 13.1 ± 14.1 | 14.9 ± 12.9 | 0.311 |
| SS (°) | 30.4 ± 9.3 | 25.8 ± 7.7 | 0.025 |
| Pelvic tilt (°) | 23.9 ± 12.9 | 28.0 ± 15.1 | 0.132 |
| TK (°) | 26.5 ± 13.3 | 23.7 ± 13.0 | 0.219 |
| TPA (°) | 20.6 ± 8.0 | 21.4 ± 6.1 | 0.342 |
| SVA (mm) | 41.4 ± 35.9 | 35.3 ± 46.6 | 0.284 |
| GL-HA (mm) | –7.6 ± 37.6 | –16.2 ± 55.4 | 0.239 |
| PJA (°) | 8.4 ± 5.2 | 9.0 ± 7.2 | 0.340 |
| Post-pre changes | |||
| Δ LL (°) | –0.4 ± 6.0 | –2.4 ± 6.9 | 0.110 |
| Δ SS (°) | –6.1 ± 11.8 | –5.1 ± 7.7 | 0.351 |
| Δ TK (°) | –4.1 ± 9.0 | –5.4 ± 8.7 | 0.298 |
| Δ TPA (°) | –7.2 ± 10.7 | –6.2 ± 6.7 | 0.340 |
| Δ SVA (mm) | –22.4 ± 52.9 | –27.8 ± 51.2 | 0.349 |
| Δ GL-HA (mm) | –8.1 ± 63.9 | –24.3 ± 59.9 | 0.164 |
| Δ PJA (°) | –22.3 ± 18.4 | –20.1 ± 15.6 | 0.935 |
Abbreviations: GL-HA, gravity line to hip axis; LL, lumbar lordosis; PJA, proximal junctional angle; R-PJF, recurrent proximal junctional failure; SS, sacral slope; SVA, sagittal vertical axis; TK, thoracic kyphosis; TPA, T1 pelvic angle.
Note: Data presented as mean ± SD. Bold P values indicate statistical significance.