Table 2.
Patients Sorted by Score Criteria With Associated Proximal Junctional Kyphosis (PJK) Rates.
| Age | <55 years | >55 years | P | |
| Number of Patients | 141 | 276 | — | |
| PJK rate | 28.40% | 50.00% | P < .001 | |
| LIV Position | Within Spine | S1/Ilium | P | |
| Number of patients | 92 | 325 | — | |
| PJK rate | 16.30% | 50.20% | P < .001 | |
| UIV Position | L1-S1 | T12-T7 | T6-T1 | P |
| Number of patients | 25 | 172 | 215 | — |
| PJK rate | 12.00% | 38.70% | 52.90% | P < .001 |
| Correction Criteria | ▵ Lordosis >10° | ▵ Lordosis <10° | P | |
| Number of patients | 171 | 215 | — | |
| PJK rate | 40.00% | 51.50% | P < .001 |
Abbreviations: PJK, proximal junctional kyphosis; LIV, lower-most instrumented vertebra; UIV, upper-most instrumented vertebra.