Spinal cord injury syndromes: from paraplegia to quadriplegia—what every neurologist should know

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Spinal cord injury remains one of the most challenging neurologic emergencies. Beyond the acute loss of motor and sensory function, patients face lifelong medical, psychological, and social challenges. Neurologists play a critical role not only in the early recognition of injury patterns but also in guiding long-term management and rehabilitation.

Acute versus chronic phases

Spinal cord injury is best considered in two phases: the acute phase, occurring in the emergency department or immediately after hospital admission, and the chronic phase, encompassing long-term management and rehabilitation. Stabilization, imaging, and surgical intervention occur acutely, whereas neurologists often become most involved during the chronic stage, addressing spasticity, pain, autonomic dysfunction, and complications of immobility.

Key incomplete syndromes

Incomplete spinal cord injury syndromes result from partial disruption of ascending and descending tracts. Recognizing these syndromes helps with localization and prognosis.

• Brown-Sequard syndrome
• Cause: Penetrating trauma or lateral compression of the cord.
• Localization: Hemisection of the spinal cord, usually incomplete. Although most lesions are partial, the clinical pattern follows that of full hemisection.
• Clinical features: Ipsilateral weakness and loss of vibration or proprioception, with contralateral loss of pain and temperature below the lesion. Deficits are often incomplete but maintain this characteristic distribution.
• Anterior cord syndrome
• Cause: Anterior spinal artery infarction, trauma, or compression.
• Localization: Ventral two-thirds of the spinal cord.
• Clinical features: Loss of motor function and pain or temperature sensation below the lesion with preservation of posterior column modalities (vibration, position sense).
• Central cord syndrome
• Cause: Hyperextension injury in patients with cervical spondylosis; less commonly, syringomyelia.
• Localization: Central gray matter and crossing spinothalamic fibers.
• Clinical features: Disproportionately greater weakness in upper extremities than lower extremities, with variable sensory loss and preserved sacral sensation.
• Posterior cord syndrome
• Cause: Trauma, compression, or neurosyphilis.
• Localization: Posterior columns.
• Clinical features: Loss of vibration and proprioception below the lesion, with preserved motor function and pain or temperature sensation.
• Conus medullaris syndrome
• Cause: Trauma, tumors, ischemia, or herniated discs affecting the lower spinal cord.
• Localization: Lesions at L1–L2 involving the conus and sacral cord.
• Clinical features: Symmetric lower extremity weakness, saddle anesthesia, early sphincter dysfunction, and mixed upper and lower motor neuron findings.
• Management: Treatment depends on the cause. Emergent decompression is indicated in compressive lesions. Supportive management includes bladder catheterization, bowel regimens, pain control, and rehabilitation for motor impairment. Neurogenic bladder and bowel management are central, and urologic follow-up is often required. Sexual counseling and assistive strategies should also be offered.

Autonomic dysfunction and secondary complications

Spinal cord injury produces not only motor and sensory loss but also significant autonomic disturbances.

• Autonomic dysreflexia: Particularly in lesions above T6, characterized by paroxysmal hypertension, bradycardia, and diaphoresis triggered by bladder or bowel irritation.
• Orthostatic hypotension: Due to loss of sympathetic tone.
• Temperature dysregulation: Impaired thermoregulatory sweating and vasomotor control.
• Respiratory compromise: High cervical lesions may require long-term ventilatory support.
• Sexual dysfunction: Common in both men and women with spinal cord injury, encompassing erectile and ejaculatory disorders in men, decreased arousal and lubrication in women, and impaired orgasm. Early counseling and management are important for quality of life.
• Other complications: Pressure ulcers, spasticity, chronic pain, urinary tract infections, osteoporosis, and deep vein thrombosis.

Conclusion

Spinal cord injury syndromes illustrate how lesion localization translates into specific clinical patterns, guiding diagnosis and prognosis. Understanding incomplete syndromes helps clinicians differentiate among patterns of motor and sensory impairment. Beyond the acute phase, neurologists remain essential in managing chronic complications, autonomic dysfunction, and the profound effects on quality of life, including sexual health. Advances in acute management and rehabilitation continue to improve long-term outcomes, but multidisciplinary care is essential throughout the patient’s life.

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