Table 4.
Change the AO subtypes and Thoracolumbar AO injury severity Score after MRI compared to CT alone.
| CT classification | MRI classification | P-value | |||||
|---|---|---|---|---|---|---|---|
| AOSpine | TLAOSIS | N | Change in AO classification, N (%) | Reason | Change in TL AOSIS, N (%) | ||
| TL AOSIS≤ 3 (non-operative treatment) | 88 | 6/88 (6.8%) | Upgrade to type B | 6/88 (6.8%) | ≤3 to >5 | ||
| A1/M0 | ≤3 | 48 | 4/48 (8%) | Upgrade to type B | 4/48 (8.3%) | ≤3 to >5 | 0 |
| A1/M1 | ≤3 | 10 | 1/10 (10%) | Upgrade to type B | 1/10 (10%) | ≤3 to >5 | 0 |
| A2/M0 | ≤3 | 5 | 0/5 (0%) | Upgrade to type B | 0/5 (0%) | ≤3 to >5 | 0 |
| A2/M1 | ≤3 | 1 | 1/1 (100%) | Upgrade to type B | 1/1 (100%) | ≤3 to >5 | 0 |
| A3/M0 | ≤3 | 24 | 0/24 (0%) | Upgrade to type B | 0/24 (0%) | ≤3 to >5 | 0 |
| TL AOSIS 4-5 (gray zone) | 4- 5 | 74 | 8/74(10%) | Upgrade to type B | 24/74(32%) | 4- 5 > 5 | |
| A4/M0 | 5 | 54 | 4/54 (7%) | Upgrade to type B | 4/54 (7%) | 5 to >5 | 0 |
| A3/M1 | 4 | 20 | 4/20 (20%) | Upgrade to type B | 20/20 (100%) | 4 to >5 (20%) 4 to ≤3 (80%) |
0 |
| TL AOSIS >5 (operative treatment) | >5 to 5 or ≤3 | 82 | 12/82(14.6%) | Upgrade to type B or downgrade to A | 5/82 (6%) | >5 to 5 or ≤3 | |
| A4/M1 | >5 | 19 | 6/19 (32%) | Upgrade to type B Downgrade to A4 |
6/19 (34%) 13/19(68%) |
>5 to >5 >5 to 5 |
0 |
| B | >5 | 54 | 4/54 (7%) | Downgrade to A4 | 4/54 (7%) | >5 to 5 | 0 |
| 1/54(2%) | Downgrade to A1 | 1/54(2%) | >5 to ≤3 | 0 | |||
| C | >5 | 9 | 0/9(0%) | — | — | — | 0 |
| Total | 244 | 25/244 (10.2%) | Upgrade to type B or down grade to A | 48/244(19.7) | — | <.0001 | |
Abbreviations: TLAOSIS , Thoracolumbar AOSpine Injury Severity Score; CT , Computed Tomography, MRI , Magnetic Resonance Imaging.