Table 5.
AIS Grade Conversion in Various Categories of the Cohort
| Category | AIS not converted | AIS converted | Total | p value |
|---|---|---|---|---|
| Accident (%) | 0.638 | |||
| Fall | 12 (33.3) | 24 (66.7) | 36 (50) | |
| MVC | 8 (40) | 12 (60) | 20 (27.8) | |
| Other | 4 (25) | 12 (75) | 16 (22.2) | |
| Total | 24 (33.3) | 48 (66.7) | 72 (100) | |
| Gender (%) | 0.18 | |||
| Male | 22 (36.7) | 38 (63.3) | 60 (83.3) | |
| Female | 2 (16.7) | 10 (83.3) | 12 (16.7) | |
| Age (SD) | 40.8 (16.2) | 48.6 (17.9) | 46.0 (17.6) | 0.07 |
| Admission AIS grade (%) | 0.058 | |||
| A | 12 (44.4) | 15 (55.6) | 27 (37.5) | |
| B | 9 (39.1) | 14 (60.9) | 23 (31.9) | |
| C | 3 (13.6) | 19 (86.4) | 22 (30.6) | |
| Total | 24 (33.3) | 48 (66.7) | 72 (100) | |
| Admission ASIA motor score (SD) | 12.7 (12.5) | 25.2 (13.9) | 21.0 (14.6) | 0.0004 |
| Morphology (%) | 0.11 | |||
| A0 (No evidence of fracture dislocation) | 6 (24) | 19 (76) | 25 (34.7) | |
| B2 or B3 (Flexion or extension injury) | 1 (12.5) | 7 (87.5) | 8 (11.1) | |
| A3/4+C (Significant translation in X/Y/Z axes) | 17 (43.6) | 22 (56.4) | 39 (54.2) | |
| Intramedullary lesion length (IMLL) (mm, SD) | ||||
| Admission grade A | 59.3 (20.7) | 35.6 (9.6) | 46.1 (19.4) | 0.002 |
| Admission grade B | 54.2 (19.1) | 31.9 (11.9) | 40.6 (18.4) | 0.003 |
| Admission grade C | 23.9 (17.1) | 27.9 (9.9) | 27.4 (10.6) | 0.472 |
| Total | 53.0 (22.1) | 31.5 (10.7) | 38.6 (18.4) | 0.00001 |
| Surgical intervention (%) | NS | |||
| ACDF | 3 (30) | 7 (70) | 10 (13.9) | |
| ACDF+Laminectomy | 5 (20) | 20 (80) | 25 (34.7) | |
| ACCF | 1 (11.1) | 8 (88.9) | 9 (12.5) | |
| ACCF+Laminectomy | 9(81.8) | 2 (18.2) | 11 (15.3) | |
| Laminectomy | 6 (35.3) | 11 (64.7) | 17 (23.6) | |
| Timing of surgery (%) | 0.424 | |||
| <12 h after trauma | 11 (34.4) | 21 (65.6) | 32 (44.5) | |
| 12-24 h after trauma | 10 (40) | 15 (60) | 25 (34.7) | |
| >24 h after trauma | 3 (20) | 12 (80) | 15 (20.8) | |
| Total | 24 (33.3) | 48 (66.7) | 72 (100) |
AIS, American Spinal Injury Association (ASIA) Impairment Scale; MVC, motor vehicle crash; SD, standard deviation; ACDF, anterior cervical discectomy and fusion; ACCF, anterior cervical corpectomy and fusion.