Table 2.
Demographics.
| Lower N=139 | Mid N=312 | p-value | |
|---|---|---|---|
| Age, years | 75.6±6.8 | 75.3±6.4 | 0.57 |
| Sex, male | 101 (73%) | 227 (73%) | 0.98 |
| Cause of injury | 0.025 | ||
| High-energy trauma | 83 (60%) | 146 (47%) | |
| Falling down | 52 (37%) | 146 (47%) | |
| Others | 4 (3%) | 20 (6%) | |
| Diagnostic delay | 16 (12%) | 24 (8%) | 0.19 |
| OPLL | 28 (20%) | 56 (18%) | 0.58 |
| OALL | 32 (23%) | 75 (24%) | 0.81 |
| Dislocation | 76 (55%) | 140 (45%) | 0.054 |
| AOSpine classification | 0.056 | ||
| A | 28 (20%) | 89 (29%) | |
| B | 39 (28%) | 97 (31%) | |
| C | 72 (52%) | 126 (40%) | |
| AOSpine classification (facet) | 0.44 | ||
| F1 | 7 (5%) | 10 (3%) | |
| F2 | 9 (6%) | 18 (6%) | |
| F3 | 3 (2%) | 14 (4%) | |
| F4 | 12 (9%) | 39 (12%) | |
| No | 108 (78%) | 231 (74%) | |
| SCI | 0.86 | ||
| Tetraplegia | 56 (40%) | 124 (40%) | |
| Central cord syndrome | 25 (18%) | 63 (20%) | |
| No | 58 (42%) | 125 (40%) | |
| AIS | 0.53 | ||
| A | 22 (16%) | 53 (17%) | |
| B | 8 (6%) | 19 (6%) | |
| C | 17 (12%) | 55 (18%) | |
| D | 34 (24%) | 60 (19%) | |
| E | 58 (42%) | 125 (40%) | |
| ISI upper expansion | 0.055 | ||
| 2 levels≤ | 12 (18%) | 18 (11%) | |
| 1 level | 27 (40%) | 51 (31%) | |
| Fracture level | 28 (42%) | 98 (59%) | |
| Unknown | 72 | 145 |
OPLL, ossification of the posterior longitudinal ligament; OALL, ossification of the anterior longitudinal ligament; AOSpine, AO (Arbeitsgemeinschaft für Osteosynthesefragen) Spine; SCI, spinal cord injury; AIS, ASIA (American Spinal Injury Association) impairment scale; ISI, increased signal intensity on magnetic resonance imaging