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Morphology (compression 1, burst 2, translation/rotation 3, distraction 4), Posterior ligamentous complex integrity (intact 0, indeterminate 2, disrupted 3), Neurologic status (intact 0, nerve root 2, complete 2, incomplete 3). Score ≥5 → surgery; ≤3 → nonoperative; 4 = gray zone.
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The Thoracolumbar Injury Classification and Severity (TLICS) score was developed by Vaccaro and colleagues in 2005 as a comprehensive, clinically applicable system for guiding surgical decision-making in thoracolumbar spine injuries. It was designed to overcome the limitations of earlier classification systems (most notably the Denis three-column model and the McAfee classification) which were primarily descriptive rather than treatment-guiding. The TLICS is now the most widely used tool for thoracolumbar injury management, providing a score from 0 to 10 that directly dictates whether a patient should be managed non-operatively, with either surgical approach, or mandatorily with surgery. It assesses three independent parameters, each reflecting a distinct and clinically important dimension of the injury.
| Morphology Type | Score | Description | Examples |
|---|---|---|---|
| Compression | 1 | Failure of the anterior and/or middle column under compressive loading; the posterior column is INTACT; this includes both pure compression fractures (wedge fractures — loss of anterior vertebral body height without posterior element involvement) and burst fractures (failure of both anterior and posterior vertebral body walls — the middle column is disrupted); the posterior wall of the vertebral body may have retropulsed fragments in burst fractures; compression morphology indicates the posterior tension band (PLC) is intact and has not failed under distraction | Wedge compression fracture; stable burst fracture; minor compression; simple anterior wedging |
| Burst | 2 | A burst fracture (specifically — when listed separately from compression): failure of the entire vertebral body under axial compression with disruption of both the anterior AND posterior vertebral body walls; bone fragments may be retropulsed into the spinal canal; the posterior elements may or may not be disrupted; Note: in the original TLICS paper, burst fractures were assigned a score of 2 (when specifically listed as a separate morphology from simple compression); some versions of TLICS group burst fractures with compression under score 1, while others give them score 2 — be aware of this variation and follow institutional protocols | Thoracolumbar burst fracture (the classic high-frequency thoracolumbar injury); retropulsed middle column fragment |
| Translational / Rotational | 3 | Significant translational or rotational malalignment between adjacent vertebrae; indicates failure of ALL three columns (anterior, middle, and posterior); this is a high-energy injury pattern; translational injury = one vertebra slides anteriorly, posteriorly, or laterally relative to the adjacent vertebra; rotational injury = one vertebra rotates relative to the next (often associated with facet subluxation or dislocation); the PLC is invariably disrupted in translational/rotational injuries | Fracture-dislocation; bilateral facet dislocation; unilateral facet dislocation with subluxation; slice fractures |
| Distraction | 4 | Failure of the spine in tension — the vertebral body or the posterior elements are distracted (pulled apart); this indicates a failure of ALL columns in tension; distractive injuries are the most unstable of all thoracolumbar injuries; the PLC is completely disrupted; the vertebral body may be split horizontally (Chance fracture — through the bone) or the ligaments may rupture (ligamentous Chance fracture); often associated with lap-seat belt injuries in road traffic accidents | Chance fracture (horizontal fracture through pedicles and vertebral body — `seatbelt fracture`); posterior ligamentous disruption with distraction; flexion-distraction injury; hyperflexion-distraction; ALL ligamentous structures are torn |
The posterior ligamentous complex (PLC) is the single most important determinant of thoracolumbar spinal stability — more important than the degree of vertebral body comminution or retropulsion. The PLC comprises: the supraspinous ligament, the interspinous ligament, the ligamentum flavum, and the facet joint capsules. Together, these structures form the posterior tension band that resists flexion, distraction, and rotation. When the PLC is intact, the posterior column can resist distraction forces and the spine is at least partially stable. When the PLC is disrupted, the posterior tension band has failed — the spine is fundamentally unstable regardless of the fracture morphology.
| PLC Status | Score | Assessment | Clinical / Imaging Features |
|---|---|---|---|
| Intact | 0 | Clinical: no midline tenderness; spinous processes not widened; Imaging: no widening of interspinous distance; facets aligned; ligamentum flavum not buckled; no high signal on T2 MRI through the PLC | The posterior tension band is intact; the spine is stabilised by the posterior ligaments; a burst fracture with intact PLC = TLICS ≤3 (compression/burst 1 or 2 + PLC 0 + neurological 0 = non-operative if no neural deficit) |
| Indeterminate / suspected | 2 | When the PLC cannot be confidently classified as intact or disrupted; or when imaging suggests but does not confirm disruption; MRI T2 signal changes within the PLC (high T2 signal = oedema or partial tear); mild interspinous widening without definite diastasis; this `indeterminate` category is the most clinically challenging — the surgeon must use their judgment | Mild interspinous widening on CT; T2 high signal through the PLC on MRI; the category score of 2 means that even a `suspected` PLC injury contributes significantly to the TLICS total; `when in doubt, treat as disrupted` applies in high-risk situations (elderly, osteoporotic patients, patients requiring early mobilisation) |
| Disrupted | 3 | Definite PLC disruption — confirmed by clinical findings (widening of interspinous gap on palpation; spinous process tenderness; visible deformity) or imaging findings (widening of interspinous distance >5–7 mm on CT; facet subluxation or dislocation; high T2 MRI signal through ALL components of the PLC; kyphosis >20° at the fracture level; anterior subluxation of adjacent vertebrae) | MRI is the most sensitive investigation for PLC assessment; T2-weighted sagittal sequences show high signal through the disrupted ligaments; MRI should be obtained for ALL burst fractures and high-energy injuries where PLC status is uncertain; a disrupted PLC adds 3 points to the TLICS — it is the highest single-parameter contributor to the score |
| Neurological Status | Score | Description | Clinical Implication |
|---|---|---|---|
| Intact (neurologically normal) | 0 | No neurological deficit on clinical examination; normal motor power; normal sensation; normal reflexes; normal bowel and bladder function | Neurological status contributes 0 to the total TLICS score; surgical decision rests on morphology and PLC status |
| Nerve root injury | 2 | Radiculopathy or peripheral nerve root injury — unilateral or bilateral; dermatomal sensory loss; myotomal weakness; reflexes altered; this does NOT include cord injury; nerve root injuries from thoracolumbar fractures are frequently from retropulsed bone in the spinal canal or foraminal compromise | Adds 2 to the TLICS score; the combination of a burst fracture (2) + intact PLC (0) + nerve root injury (2) = TLICS 4 — the borderline; surgical decompression may be considered to relieve radiculopathy; TLICS 4 = `either treatment option may be appropriate` |
| Complete cord/conus/cauda equina injury | 2 | COMPLETE spinal cord injury (ASIA A — no motor or sensory function below the level of injury); conus medullaris injury (below T12-L1); cauda equina syndrome (complete — bowel and bladder dysfunction, saddle anaesthesia, bilateral leg weakness); Note: a complete cord injury AND a nerve root injury score the same (2) — surgical decompression in a complete cord injury is primarily for stability, pain control, and early rehabilitation (recovery is not expected); for cauda equina syndrome, urgent decompression is critical as it involves peripheral nerve roots (which CAN recover) | Contributes 2 to total TLICS; for complete cord injuries, surgery is for stabilisation and early mobilisation rather than neurological recovery; for complete cauda equina syndrome (ACES — acute cauda equina syndrome) — URGENT surgical decompression within 24–48 hours of onset is mandatory (peripheral nerve recovery is possible) |
| Incomplete cord / conus injury | 3 | INCOMPLETE spinal cord or conus medullaris injury (ASIA B, C, or D — some preserved motor or sensory function below the injury level); the most surgically urgent neurological category because: (1) there is preserved neural function that can potentially be recovered or protected; (2) ongoing compression may worsen function; (3) urgent decompression and stabilisation is the standard of care | Adds 3 to the total TLICS — the highest single neurological contribution; incomplete cord injury alone contributes sufficient points that virtually all such patients have a total TLICS ≥5 → surgical management is indicated; timing is critical — decompression within 24 hours is associated with improved neurological outcomes for incomplete cord injuries |
| Total TLICS Score | Treatment Recommendation | Rationale |
|---|---|---|
| ≤3 (0–3) | Non-operative management — brace/orthosis (TLSO — thoracolumbar sacral orthosis); early mobilisation; analgesia; rehabilitation; no surgical fixation required | Low-energy injuries with intact PLC and no (or only mild) neurological deficit; the spine is sufficiently stable for non-operative management; the risk of surgical complications outweighs the benefit for these injuries; example: simple compression wedge fracture with intact PLC and no neurological deficit = TLICS 1 = non-operative |
| = 4 | Either operative or non-operative — individualise based on: patient factors (age, comorbidities, bone quality, expected compliance); functional demands; kyphosis degree; canal compromise; surgeon preference; institution-specific protocols; the borderline score | The `borderline zone` where both approaches have evidence; a TLICS of 4 represents genuine equipoise — evidence does not strongly favour one approach; clinical factors (e.g., a young labourer with a burst fracture + nerve root injury + intact PLC = TLICS 4 may benefit more from surgery than a sedentary elderly patient with the same score) |
| ≥5 (5–10) | Operative management — surgical stabilisation ± decompression | High-energy injuries with PLC disruption, significant neurological deficit, or both; the spine is mechanically unstable or neurological recovery requires urgent decompression; the benefit of surgery clearly outweighs the risk; examples: burst fracture + disrupted PLC + neurologically intact = 2 + 3 + 0 = TLICS 5 = surgery; distraction injury + intact PLC + incomplete cord = 4 + 0 + 3 = TLICS 7 = surgery |
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