## Most Common Site of Traumatic Spinal Cord Injury **Key Point:** The cervical spine, particularly C4–C7, is the most frequent site of spinal cord injury in trauma, accounting for approximately 50–60% of all traumatic spinal cord injuries. ### Anatomical & Biomechanical Basis 1. **Cervical vulnerability**: The cervical spine has greater mobility and less muscular support compared to the thoracic spine, making it more susceptible to hyperextension, hyperflexion, and shear forces during motor vehicle accidents, falls, and diving injuries. 2. **Common mechanisms**: - Motor vehicle collisions (whiplash, flexion-distraction) - Falls from height with head impact - Diving into shallow water (hyperextension) - Sports injuries (rugby, American football) ### Frequency Distribution of Traumatic SCI by Level | Spinal Level | Frequency | Clinical Significance | |---|---|---| | Cervical (C1–C8) | 50–60% | **Most common**; often tetraplegia | | Thoracic (T1–T12) | 30–35% | Paraplegia; better prognosis | | Lumbar (L1–L5) | 5–10% | Conus/cauda equina; variable | | Sacral (S1–S5) | <5% | Rare in isolation | **High-Yield:** C5 is the single most common level of injury, often resulting in **C5 tetraplegia** with preserved shoulder abduction but loss of elbow extension and hand grip. ### Clinical Pearl Cervical SCI carries the worst functional prognosis because injury at this level affects all four limbs (tetraplegia) and may compromise respiratory muscles if the lesion is above C4 (phrenic nerve). In contrast, thoracic and lumbar injuries spare the upper limbs, allowing better functional recovery and independence. **Mnemonic:** **CHIT** — **C**ervical is **H**ighest (most common), **I**njury level, **T**raumatic SCI.
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