Comparison of PJKSS scores at the revision surgery.
| PJKSS components | No R-PJF (N = 36) | R-PJF (N = 24) | P | |
| Neurological deficit | 0.107 | |||
| 0 pt | None | 5 (13.9%) | 0 (0%) | |
| 2 pt | Radicular pain | 18 (50.0%) | 11 (45.8%) | |
| 4 pt | Myelopathy | 13 (36.1%) | 13 (54.2%) | |
| Focal pain | 0.319 | |||
| 0 pt | None | 5 (13.9%) | 1 (4.2%) | |
| 1 pt | VAS ≤4 | 1 (2.8%) | 0 (0%) | |
| 3 pt | VAS ≥5 | 30 (83.3%) | 23 (95.8%) | |
| Instrumentation problem | 0.115 | |||
| 0 pt | None | 15 (41.7%) | 6 (25.0%) | |
| 1 pt | Partial fixation loss | 16 (44.4%) | 17 (70.8%) | |
| 2 pt | Complete fixation loss | 5 (13.9%) | 1 (4.2%) | |
| Change in kyphosis/PLC integrity | 0.731 | |||
| 0 pt | 0°–10° | 8 (22.2%) | 5 (20.8%) | |
| 1 pt | 10°–20° | 12 (33.3%) | 6 (25.0%) | |
| 2 pt | > 20° or PLC failure | 16 (44.4%) | 13 (54.2%) | |
| UIV/UIV +1 fracture | 0.026 | |||
| 0 pt | None | 12 (33.3%) | 5 (20.8%) | |
| 1 pt | Compression fracture | 13 (36.1%) | 17 (70.8%) | |
| 2 pt | Burst/chance fracture | 11 (30.6%) | 2 (8.3%) | |
| 3 pt | Translation | 0 (0%) | 0 (0%) | |
| Level of UIV | 0.729 | |||
| 0 pt | Thoracolumbar junction | 30 (83.3%) | 21 (87.5%) | |
| 1 pt | Upper thoracic | 6 (16.7%) | 3 (12.5%) | |
| Total sum of PJKSS | 8.1 ± 2.0 | 9.1 ± 2.1 | 0.023 | |
Abbreviations: PJKSS, proximal junctional kyphosis severity scale; PLC, posterior ligamentous complex; R-PJF, recurrent proximal junctional failure; UIV, uppermost instrumented vertebrae; VAS, visual analog scale.
Note: Data presented as n (%) or mean ± SD. Bold P values indicate statistical significance.