Quadriplegia — also called tetraplegia — is paralysis of all four limbs and the torso. It results from damage to the cervical (neck) spinal cord. The injury disrupts movement, sensation, and often automatic body functions like breathing and bladder control.
The two terms describe the same condition. "Tetraplegia" is the preferred term in international medical literature. "Quadriplegia" is more common in the United States, including in legal and insurance documents.
Both words come from roots meaning "four limbs" — "tetra" from Greek, "quadri" from Latin.
Quadriplegia vs. Paraplegia: What Is the Difference?
People often mix up these two terms. They describe different injury levels.
Paraplegia is paralysis of the legs and lower body. It results from damage to the thoracic, lumbar, or sacral spine — the sections below the neck.
Quadriplegia is paralysis of all four limbs — both arms and both legs — plus the trunk. It results from damage to the cervical spine at levels C1 through C8.
The key difference is location. A neck injury causes quadriplegia. A lower-spine injury causes paraplegia. Both are severe, but quadriplegia affects the upper body and breathing in ways paraplegia does not.
What Causes Quadriplegia?
Quadriplegia can follow a traumatic accident or a non-traumatic medical condition.
Traumatic Causes
- Motor vehicle accidents — The leading cause of traumatic spinal cord injury in the U.S.
- Falls — The second most common cause, especially among older adults
- Sports injuries — Diving into shallow water, football tackles, gymnastics, and similar high-impact activities
- Violence — Gunshot wounds and other assaults
About 18,421 new traumatic spinal cord injuries occur each year in the United States, per NSCISC 2025 data. Roughly 308,620 people currently live with a traumatic spinal cord injury.
Non-Traumatic Causes
Quadriplegia is not always the result of an accident. Medical conditions can damage the cervical spinal cord or the brain's ability to control the limbs:
- Multiple sclerosis (MS)
- Stroke
- Spinal cord tumors
- Transverse myelitis (inflammation of the spinal cord)
- Amyotrophic lateral sclerosis (ALS)
- Guillain-Barré syndrome
Spinal Cord Injury Levels That Cause Quadriplegia
The cervical spine has eight segments, labeled C1 through C8. The higher the injury on the spine, the more of the body is affected.
C1–C2: The most severe level. Injuries here cause complete loss of function in all four limbs and loss of independent breathing. Most people require a ventilator.
C3–C4: Breathing is usually impaired. Full-time respiratory support is common. Arm and hand function is absent.
C5–C6: Some shoulder and bicep movement is preserved. People injured here may be able to feed themselves with adaptive equipment.
C7–C8: Some wrist extension and hand function can be retained. People with these injuries have the most independence among quadriplegics. Some can transfer themselves between a bed and wheelchair without help.
A simple rule: the closer the injury is to C1, the greater the loss of function.
Complete vs. Incomplete Quadriplegia
Spinal cord injuries are classified as complete or incomplete based on whether any nerve signals can still pass through the damaged area.
Complete quadriplegia means total loss of motor and sensory function below the injury level. No signals travel from the brain to the limbs or organs below the injury site.
Incomplete quadriplegia means some signals still get through. A person with an incomplete injury may keep partial movement, sensation, or control of some functions below the injury level. The range varies widely — from faint tingling to meaningful arm or leg movement.
Clinicians use the ASIA Impairment Scale to grade injuries from A (complete — no sensory or motor function below injury level) to E (normal sensory and motor function). Most people fall somewhere between B and D.
Incomplete quadriplegia is now the most common new spinal cord injury classification in the U.S. It accounts for about 30.1% of new cases, according to the National Spinal Cord Injury Statistical Center (NSCISC). Complete quadriplegia accounts for 20.4%.
Symptoms and Complications of Quadriplegia
The main symptom is paralysis or weakness in all four limbs and the trunk. But the spinal cord controls many body systems, so quadriplegia typically brings a range of additional complications.
Motor and sensory effects:
- Loss of movement in arms, hands, legs, and feet
- Loss of sensation, or abnormal sensations like tingling or burning
- Uncontrolled muscle spasms (spasticity)
Breathing:
- Difficulty breathing, especially with C1–C4 injuries
- Higher risk of pneumonia because coughing is impaired
Bladder and bowel:
- Bladder control loss, leading to frequent urinary tract infections (UTIs)
- Bowel dysfunction requiring scheduled management
Heart and circulation:
- Low blood pressure when sitting up (orthostatic hypotension)
- Autonomic dysreflexia — a sudden dangerous spike in blood pressure triggered by stimuli below the injury level
- Difficulty regulating body temperature
Skin:
- Pressure sores from the inability to shift position independently
Mental health:
- Depression and anxiety are common. The injury is sudden and life-altering.
Life Expectancy and Long-Term Care Costs
Quadriplegia reduces life expectancy. A 15-year-old with a high-level (C1–C4) spinal cord injury is expected to live about 37.6 more years, according to NSCISC data. A peer without a spinal cord injury would be expected to live about 64.2 more years — a difference of more than 26 years.
The financial costs are equally significant. According to the NSCISC 2025 Facts and Figures, for a person who sustains high tetraplegia (C1–C4) at age 25:
- First year after injury: approximately $1,410,163 in medical and living expenses
- Each year after that: approximately $184,891
- Estimated lifetime costs: approximately $6.26 million
These figures cover medical care, rehabilitation, home modifications, and personal assistance. They do not include lost wages, pain and suffering, or loss of enjoyment of life.
Frequently Asked Questions About Quadriplegia
Is quadriplegia the same as tetraplegia?
Yes. Both terms describe the same condition — paralysis of all four limbs due to cervical spinal cord damage. "Tetraplegia" appears in international clinical literature. "Quadriplegia" is more common in the U.S., especially in legal and insurance contexts.
Can quadriplegia be cured?
There is currently no cure for spinal cord injuries that cause quadriplegia. Some people with incomplete injuries regain partial function through intensive rehabilitation. For most traumatic cases — particularly complete injuries — paralysis is permanent. Research into nerve regeneration and experimental treatments continues.
What are the first signs of a spinal cord injury that causes quadriplegia?
Right after a cervical spinal cord injury, a person may experience sudden weakness or numbness in the arms and legs, trouble breathing, and loss of bladder or bowel control. These are medical emergencies. The spine should be immobilized and emergency services called right away.
How is quadriplegia different from paraplegia?
Paraplegia affects the legs and lower body only. It results from damage to the thoracic, lumbar, or sacral spine. Quadriplegia affects all four limbs and the trunk. It results from cervical spinal cord damage. Quadriplegia generally involves greater functional loss, including potential effects on breathing and arm movement.
What are the most common causes of quadriplegia?
The most common traumatic causes are motor vehicle accidents, falls, sports injuries (especially diving accidents), and violence. Non-traumatic causes include multiple sclerosis, stroke, and spinal tumors.
How long can a person with quadriplegia live?
Life expectancy depends on the injury level, completeness, the person's age, and quality of medical care. Many people with quadriplegia live for decades after their injury. However, NSCISC data shows high-level cervical injuries can cut life expectancy by 25 years or more compared to the general population.
Sources & Official Resources
Medical & Statistical Sources
- NSCISC 2025 Traumatic Spinal Cord Injury Facts and Figures at a Glance
- NSCISC — National Spinal Cord Injury Statistical Center
- Christopher & Dana Reeve Foundation — Complete vs. Incomplete SCI
- American Spinal Injury Association (ASIA) — ASIA Impairment Scale
- Cleveland Clinic — Quadriplegia (Tetraplegia)
New York Legal Framework 6. CPLR Article 14-A — Comparative Negligence
Contact The Orlow Firm
If a family member has suffered a spinal cord injury because of someone else's negligence — in a car crash, a fall, or a construction accident — the consequences extend far beyond the hospital. The Orlow Firm has represented spinal cord injury victims in Queens and throughout New York City for over 40 years.
Our Queens spinal cord injury lawyers offer a free consultation. We work on contingency — you pay nothing unless we recover for you. Call (646) 647-3398 today. Se Habla Español.
