AOSpine Thoracolumbar Spine Injury Classification System.
| Type A | COMPRESSION FRACTURE |
|---|---|
| A0 | No fracture of the vertebral body - Fracture of the spinous or transverse process |
| A1 | Wedge compression fracture with single endplate involvement and no posterior wall involvement |
| A2 | Split or pincer type fracture |
| A3 | Incomplete burst fracture: Single endplate fracture |
| A4 | Complete burst fracture |
| Type B | TENSION BAND INJURIES |
| B1 | Monosegmental bony posterior band injury |
| B2 | Posterior tension band disruption: Bony and/or ligamentous |
| B3 | Hyperextension injury |
| Type C | DISPLACEMENT/ TRANSLATIONAL INJURIES |
| C | Displacement beyond physiological range |