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Emergency and Acute Medicine: Lumbar Spine Injury
Lumbar spine injuries result from significant mechanical forces applied to the lower back, most commonly due to blunt trauma such as motor vehicle accidents, falls from height, or direct impact. These injuries can involve a wide spectrum, ranging from stable compression fractures to highly unstable injuries with neurologic compromise. The type of injury depends on the mechanism involved, including flexion, compression, distraction, rotation, extension, or shear forces.
Flexion-compression injuries include wedge fractures, which are typically stable when less than 50% of the vertebral body height is lost and are not associated with ligamentous disruption or neurologic deficits. In contrast, burst fractures are more severe and involve retropulsion of bone fragments into the spinal canal, often causing kyphotic deformity and potential neurologic injury. Flexion-distraction injuries, such as the classic Chance fracture, are often associated with seatbelt injuries and may coexist with intra-abdominal trauma. More severe patterns like facet dislocations, rotational injuries, and translational (shear) injuries involve significant ligamentous disruption and are frequently unstable with a high risk of neurologic deficits. Less severe injuries include isolated spinous or transverse process fractures, which are generally stable but may occasionally involve nerve root irritation.
Patients typically present with midline lumbar pain, tenderness, bruising, deformity, or muscle spasm. Physical examination may reveal increased interspinous distance or a palpable step-off suggesting vertebral displacement. Neurologic deficits may occur depending on the level and severity of injury, including weakness, sensory loss, reflex abnormalities, or loss of bladder control. Pain may be masked in patients with multiple injuries or altered mental status, making imaging essential in these cases.
A detailed neurologic examination is crucial and should include assessment of motor strength, sensory levels, reflexes, rectal tone, and perineal sensation. Specific nerve root functions can help localize injury—for example, ankle dorsiflexion (L4–L5), toe extension (L5), and knee reflexes (L2–L4). Clinical suspicion should be high in patients with high-risk mechanisms, altered consciousness, intoxication, or distracting injuries.
Imaging plays a central role in diagnosis. Initial evaluation typically includes anteroposterior and lateral lumbar radiographs, but these may miss certain injuries, including up to 25% of burst fractures. Features suggesting instability include significant vertebral height loss (>50%), kyphosis, widening of interspinous distance, or vertebral translation. Therefore, CT scanning is often required for further characterization and assessment of spinal canal involvement, while MRI is indicated when there is concern for spinal cord or ligamentous injury.
Management begins with strict spinal immobilization and standard trauma resuscitation (ABCs). Patients with neurologic deficits or unstable fractures require urgent consultation with orthopedic spine or neurosurgical specialists. The use of high-dose corticosteroids such as methylprednisolone remains controversial and should be considered only in consultation with specialists.
Stable injuries in neurologically intact patients—such as minor compression fractures, isolated transverse or spinous process fractures, and some stable burst fractures—may be managed conservatively. Treatment includes pain control, activity modification, and sometimes bracing or orthotic support. Patients are advised to limit activities, avoid positions that worsen deformity, and follow structured recovery plans.
All patients with lumbar fractures generally require hospital admission for monitoring, pain management, and evaluation for associated injuries. However, selected patients with stable injuries and no neurologic deficits may be discharged with close follow-up, provided that imaging confirms stability and adequate support systems are in place.
Important pitfalls include missing unstable injuries on plain radiographs, underestimating injury severity in patients with distracting injuries, and failing to recognize alternative diagnoses such as infection, malignancy, or hematoma—especially in elderly or anticoagulated patients. Early imaging with CT, careful neurologic assessment, and specialist involvement are essential to optimize outcomes and prevent complications.
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