What are the common causes of quadriplegia?

Causes of Quadriplegia

Traumatic spinal cord injury, particularly cervical spine trauma, is the leading cause of quadriplegia, with motor vehicle accidents accounting for approximately 50% of cases, followed by falls (25%) and sports injuries (10%). 1

Traumatic Causes (Most Common)

Motor Vehicle Accidents

• Motor vehicle collisions represent the single most common etiology, responsible for half of all traumatic spinal cord injuries leading to quadriplegia 1
• Males are affected five times more often than females, with peak incidence in ages 15-34 years 1
• Helmet-to-helmet collisions in contact sports can cause transient or permanent quadriplegia 2

Falls

• Falls account for approximately 25% of traumatic quadriplegia cases 1
• The elderly population faces disproportionately higher risk from falls compared to other age groups 1
• Falls from trees have been documented as a common cause of severe spinal injury and traumatic quadriplegia in certain occupational settings 3

Sports-Related Injuries

• Sports injuries cause approximately 10% of traumatic spinal cord injuries 1
• Contact sports with high-velocity impacts carry particular risk for cervical spine trauma 2

Central Cord Syndrome (Emerging as Most Common)

Central cord syndrome is expected to soon become the most common form of acute traumatic spinal cord injury due to population aging 4

• Typically occurs in older individuals after low-energy trauma or falls 4
• Presents as cervical incomplete injury without fracture or dislocation 4
• Characterized by disproportionately greater motor impairment in upper extremities compared to lower extremities, bladder dysfunction, and varying sensory loss 4
• Results from hyperextension mechanism in patients with spondylotic or congenitally narrow spinal canal 4

Vascular Causes

Cerebrovascular Accidents

• Bilateral anterior cerebral artery infarction can cause acute quadriplegia with akinetic mutism, hypotonia, and bilateral extensor plantar reflexes 5
• Azygous anterior cerebral artery infarction represents a rare but documented cause 5
• Pontine infarction from vertebrobasilar system occlusion is the most common cause of locked-in syndrome, which presents with quadriplegia and preserved consciousness 6

Blunt Cerebrovascular Injury

• Cervical spine fractures, particularly subluxation and fractures involving the transverse foramen, carry highest risk for vertebral artery injury 4
• Upper cervical spine injuries are strongly associated with blunt cerebrovascular injury 4

Neurodegenerative Causes

Amyotrophic Lateral Sclerosis (ALS)

• ALS ultimately progresses to functional quadriplegia through degeneration of motor neurons in brain and spinal cord 7
• Characterized by hyperreflexia, spasticity, muscle fasciculations, atrophy, and progressive weakness 7
• Most commonly begins in limbs (two-thirds of cases), with bulbar onset in one-third 7

Inflammatory/Autoimmune Causes

Guillain-Barré Syndrome

• Presents with rapidly progressive motor weakness, though typically with areflexia or hyporeflexia 8
• Rare presentations with hyperreflexia have been documented, creating diagnostic challenges 8
• Can progress from lower limb to upper limb weakness within 24 hours 8

Rheumatoid Arthritis

• Functional quadriplegia can occur as an initial presentation of severe rheumatoid arthritis, though this is rare 9
• More commonly causes quadriplegia secondary to atlantoaxial dislocation with spinal cord compression 9

Traumatic Brainstem Injury

• Combined brainstem and upper cervical injury can cause locked-in syndrome with quadriplegia 6
• Cervicomedullary contusion after head trauma represents a potentially reversible cause requiring aggressive treatment and early rehabilitation 6

Critical Clinical Pitfalls

Complete quadriplegia carries a high early case-fatality ratio due to associated head injury and pulmonary dysfunction 1

• Cervical and high thoracic injuries produce respiratory failure and profound hypotension from loss of cardiovascular sympathetic innervation 4
• Secondary immunodeficiency ("immune paralysis") from loss of sympathetic innervation to lymphatic organs increases infection susceptibility 4
• Transport delays to specialized centers often result in patients arriving outside the critical 24-hour therapeutic window for decompression 4