TLICS — Thoracolumbar Injury Classification and Severity Score¶
Overview¶
The Thoracolumbar Injury Classification and Severity Score (TLICS) is a scoring system developed by the Spine Trauma Study Group to guide management decisions for thoracolumbar spine fractures. TLICS integrates three key clinical and radiological parameters — injury morphology, posterior ligamentous complex (PLC) integrity, and neurological status — into a single numerical score that correlates with treatment recommendations.
Scoring Components¶
1. Injury Morphology¶
| Pattern | Points |
|---|---|
| Compression fracture | 1 |
| Burst fracture | 2 |
| Translation/rotation (fracture-dislocation) | 3 |
| Distraction (flexion-distraction, hyperextension) | 4 |
2. Posterior Ligamentous Complex (PLC) Integrity¶
| Status | Points |
|---|---|
| Intact | 0 |
| Indeterminate (suspected injury) | 2 |
| Disrupted | 3 |
3. Neurological Status¶
| Status | Points |
|---|---|
| Intact | 0 |
| Nerve root injury | 2 |
| Incomplete spinal cord injury or cauda equina syndrome | 3 |
| Complete spinal cord injury | 2 |
Clinical Pearl
In TLICS, incomplete spinal cord injury (3 points) scores higher than complete spinal cord injury (2 points). This reflects the rationale that incomplete injuries have the greatest potential to benefit from surgical decompression and stabilization, whereas complete injuries have less potential for neurological recovery.
Score Interpretation¶
| Total TLICS Score | Recommended Management |
|---|---|
| ≤3 | Conservative (non-operative) |
| 4 | Surgeon's judgment — either conservative or operative |
| ≥5 | Operative |
Imaging Assessment of PLC¶
Determining PLC integrity is the most challenging component of TLICS scoring and requires MRI in many cases:
Intact PLC — Normal signal and morphology of the supraspinous ligament, interspinous ligament, ligamentum flavum, and facet capsules on MRI. No widening of the interspinous space on CT.
Indeterminate PLC — Equivocal findings on MRI (mild interspinous edema without clear disruption), or MRI is unavailable and CT findings are ambiguous.
Disrupted PLC — High signal in the interspinous region on STIR/T2 with clear ligamentous discontinuity, facet joint widening or diastasis, perched or dislocated facets, or widened interspinous distance on CT.
Example Cases¶
Case 1: L1 compression fracture, PLC intact, neurologically intact - Morphology: 1 + PLC: 0 + Neurology: 0 = 1 → Conservative
Case 2: T12 burst fracture, PLC indeterminate, nerve root deficit - Morphology: 2 + PLC: 2 + Neurology: 2 = 6 → Operative
Case 3: L1 flexion-distraction injury, PLC disrupted, incomplete cord injury - Morphology: 4 + PLC: 3 + Neurology: 3 = 10 → Operative
Limitations¶
- PLC assessment on MRI has moderate interobserver variability
- The scoring system does not account for patient-specific factors (age, comorbidities, bone quality)
- The AO Spine Injury Severity Score has increasingly replaced TLICS as a more comprehensive scoring tool
- The "indeterminate" PLC category (2 points) can make borderline cases difficult to classify
Key Points¶
- TLICS uses three parameters: injury morphology, PLC integrity, and neurological status
- Scores ≤3 favor conservative treatment; scores ≥5 favor surgery; score of 4 is a gray zone
- Incomplete cord injury scores higher than complete injury, reflecting greater potential for recovery
- MRI is essential for accurate PLC assessment
- TLICS provides a simple, reproducible framework for surgical decision-making in thoracolumbar trauma
References¶
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Vaccaro AR, Lehman RA Jr, Hurlbert RJ, et al. A new classification of thoracolumbar injuries: the importance of injury morphology, the integrity of the posterior ligamentous complex, and neurologic status. Spine (Phila Pa 1976). 2005;30(20):2325-2333. PubMed
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Lee JY, Vaccaro AR, Lim MR, et al. Thoracolumbar injury classification and severity score: a new paradigm for the treatment of thoracolumbar spine trauma. J Orthop Sci. 2005;10(6):671-675. PMC
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Jiménez-Almonte JH, King JD, Luo TD, Cassidy RC, Aneja A. Classifications in Brief: Thoracolumbar Injury Classification and Injury Severity Score System. Clin Orthop Relat Res. 2018;476(6):1352-1358. PMC
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Joaquim AF, Bastos DCA, Torres HHJ, Patel AA. Thoracolumbar Injury Classification and Injury Severity Score System: A Literature Review of Its Safety. Global Spine J. 2016;6(1):80-85. PMC
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Khurana B, Sheehan SE, Sodickson A, Bono CM, Harris MB. Traumatic thoracolumbar spine injuries: what the spine surgeon wants to know. RadioGraphics. 2013;33(7):2031-2046. PubMed
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West C, Roosendaal S, Bot J, Smithuis F. TLICS Classification of fractures. The Radiology Assistant. May 1, 2015. radiologyassistant.nl
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Gaillard F, et al. Thoracolumbar injury classification and severity score (TLICS). Radiopaedia. radiopaedia.org