Comparison of variables at the index surgery.
| Variables | No R-PJF (N = 36) | R-PJF (N = 24) | P |
| Total fusion levels | 7.5 ± 1.8 | 7.0 ± 1.3 | 0.320 |
| Pelvic fixation | 20 (55.6%) | 13 (54.2%) | 1.000 |
| Pelvic incidence (°) | 52.4 ± 6.2 | 49.8 ± 6.9 | 0.070 |
| Lumbar lordosis (°) | 43.2 ± 13.8 | 40.9 ± 15.8 | 0.276 |
| PI–LL (°) | 9.1 ± 13.2 | 8.9 ± 14.6 | 0.473 |
| Sacral slope (°) | 31.8 ± 8.7 | 28.6 ± 8.9 | 0.087 |
| Pelvic tilt (°) | 19.4 ± 6.6 | 19.5 ± 8.0 | 0.491 |
| Thoracic kyphosis (°) | 25.2 ± 10.7 | 22.1 ± 9.5 | 0.124 |
| T1 pelvic angle (°) | 17.0 ± 7.7 | 17.0 ± 9.4 | 0.491 |
| Sagittal vertical axis (mm) | 19.0 ± 30.1 | 39.0 ± 26.5 | 0.005 |
| Gravity line to hip axis (mm) | –10.9 ± 32.9 | –29.1 ± 38.4 | 0.031 |
| Age-adjusted PI–LL | 0.018 | ||
| Undercorrection | 8 (22.2%) | 8 (33.8%) | |
| Matched correction | 22 (61.1%) | 6 (25.0%) | |
| Overcorrection | 6 (16.7%) | 10 (41.7%) | |
| Global alignment and proportion score | 0.180 | ||
| Proportioned | 10 (27.8%) | 2 (8.3%) | |
| Moderately disproportioned | 10 (27.8%) | 9 (37.5%) | |
| Severely disproportioned | 16 (44.4%) | 13 (54.2%) | |
| Scoliosis research society-Schwab PI–LL modifier | 0.510 | ||
| PI–LL < 10° | 24 (66.7%) | 13 (54.2%) | |
| PI–LL 10°–20° | 5 (13.9%) | 6 (25.0%) | |
| PI–LL > 20° | 7 (19.4%) | 5 (20.8%) |
Abbreviations: PI–LL, pelvic incidence–lumbar lordosis; R-PJF, recurrent proximal junctional failure.
Note: Data presented as mean ± SD or n (%). Bold P values indicate statistical significance.