Table 2 The AO Spine thoracolumbar spine injury classification system. [4]
From: Accuracy of MRI (TLICS vs AOSIS) in assessment of thoracolumbar spine injuries for guiding treatment
Type A (compression fractures) | |
 A0 | Minimal injuries such as transverse process fractures |
 A1 | Wedge compression |
 A2 | Pincer compression injury |
 A3 | Incomplete burst fracture: fracture that only involves a single endplate |
 A4 | Complete burst fracture: fracture that involves both endplates |
Type B (band injuries) | |
 B1 | Osseous disruption of the tension band |
 B2 | Posterior tension band injury including ligamentous |
 B3 | Anterior tension band injury |
Type C (displacement or dislocation) | |
 N (neurological status) |  |
 N0 | Neurologically intact |
 N1 | Transient neurological deficit |
 N2 | Radicular symptoms |
 N3 | Incomplete spinal cord injury or any degree of cauda equina |
 N4 | Complete spinal cord injury |
 Nx | Neurological status is unknown |