Spinal Cord Injury Levels Explained for Virginia Families

A spinal cord injury is grouped in two ways: by its level on the spine, and by whether it is complete or incomplete. Those two answers shape what a person may feel and move afterward.

If you’re trying to make sense of a diagnosis, the question is often simple: what are the different levels of spinal cord injury? This guide explains each level in plain language, so you can follow what doctors tell you.

How spinal cord injuries are classified

Doctors classify a spinal cord injury by its location and by whether it is complete or incomplete. Location shows which body parts may be affected. Completeness shows how many signals still get through.

The spinal cord is a bundle of nerve tissue that runs inside the spine. It carries signals between the brain and the rest of the body. When it is damaged, signals below the injury can be weakened or blocked.

Two people with injuries at the same level can still differ a lot. One may keep some feeling or movement below the injury, and the other may keep none. That’s why doctors look at both factors together, not just one.

A quick map of your spine: what the letters and numbers mean

Each spinal bone has a letter for its region and a number for its position. Together, the letter and number show where an injury sits.

The spine has 33 vertebrae, the stacked bones that protect the spinal cord. They fall into five regions: cervical (neck), thoracic (mid-back), lumbar (lower back), sacral (base of the spine) and coccygeal (tailbone).

Numbers count down from the top of each region. C1 is the highest cervical bone, just below the skull, and T1 is the highest thoracic bone. So C5 is lower than C2, and T10 is lower than T3.

Higher injuries usually affect more of the body. The cord carries signals from the brain to every part below the injury, so a higher break cuts off more of those signals.

Cervical (neck) spine injuries: C1 through C8

Cervical injuries sit in the neck, the highest part of the spine, and they often have the most wide-reaching effects. The National Institute of Neurological Disorders and Stroke explains that the cervical nerves (C1 to C7) control signals to the back of the head, neck, shoulders, arms, hands and the diaphragm.

C1 and C2 injuries are extremely serious. Injuries between C1 and C4 can stop breathing, because those nerves control the diaphragm and lung expansion. These injuries need emergency care right away.

C3 through C5 injuries typically affect arm and hand function. A person may keep some arm movement, depending on the exact level.

C6 through C8 injuries generally allow more arm and hand use. Grip strength and finger control may still be affected.

Many cervical injuries result in quadriplegia, which means paralysis affecting all four limbs. The arms, hands, torso and legs can all be involved, depending on the level and how complete the injury is.

Thoracic spine injuries: T1 through T12

Thoracic injuries affect the mid-back. The arms and hands usually keep full or near-full function.

The thoracic nerves (T1 to T12) control signals to the chest muscles, some back muscles and many organ systems, according to the NINDS spinal cord injury page.

High thoracic injuries, from T1 to T6, can affect trunk stability and breathing. Lower thoracic injuries, from T7 to T12, generally allow better trunk control.

Thoracic injuries usually affect the legs and lower body. Many of them result in paraplegia, which means paralysis affecting the legs and lower body, while the arms and hands stay working.

Lumbar and sacral spine injuries: L1 through S5

Lumbar and sacral injuries affect the lower body. The arms, hands and upper body usually keep full function.

The lumbar nerves (L1 to L5) control signals to the lower abdomen, back, buttocks, external genital organs and parts of the legs, per NINDS.

The sacral nerves (S1 to S5) control signals to the thighs, lower legs, feet, most external genital organs and the area around the anus.

Lumbar and sacral injuries typically result in paraplegia. Bowel and bladder function can also be affected at these levels, which is one reason rehabilitation plans often address them.

Complete versus incomplete spinal cord injuries

A complete injury means no signals cross the damaged area, while an incomplete injury means some still do. This is often the most important detail after the level.

A complete spinal cord injury is marked by total loss of motor and sensory function below the injury level. Motor function means movement, and sensory function means feeling. The cord is fully severed or damaged so badly that no signals pass the injury site.

An incomplete injury means some nerve fibers remain intact. A person may keep some feeling, some movement, or both below the injury.

Incomplete injuries vary more from person to person. Two people with incomplete injuries at the same level may have very different abilities. Doctors watch how each person responds to rehabilitation over time.

Is spinal cord injury serious?

Yes. Every spinal cord injury is serious, and the level and completeness shape how much daily life changes.

Even lower-level or incomplete injuries can cause lasting disability. Higher-level injuries carry greater immediate medical risk, and they usually involve more of the body.

Daily life may need adaptive equipment, changes to the home and ongoing therapy. Families often find that these needs grow and change over the years, not just in the first weeks.

What happens if you break your C1 and C2?

A break at C1 or C2 is among the most serious spinal injuries, and it needs emergency care right away.

C1 and C2 are the two highest cervical bones, at the top of the neck. Damage at these levels can affect the nerves that control breathing and all four limbs.

A severe injury here may need a ventilator, a machine that helps a person breathe. It can also cause paralysis of all four limbs.

How a person fares depends on the exact nature of the injury and how quickly treatment starts. Emergency teams focus first on breathing and stabilizing the neck.

What is posterior cord injury?

Posterior cord syndrome is an incomplete injury to the back part of the spinal cord. It is less common than other incomplete injury patterns.

The back part of the cord carries signals for body position and vibration. When it is damaged, a person may lose the sense of where their body is in space.

Some people can still move their arms and legs, but balance and coordination can suffer. Pain and temperature sense are usually preserved in this pattern.

Because the body can’t sense its own position well, everyday tasks like walking on uneven ground can become less safe. Rehabilitation often focuses on relearning balance and using vision to compensate.

When a spinal cord injury happens in a crash

A spinal cord injury in a crash can happen when impact fractures or shifts the spine, or presses on the cord. The severity depends on the crash’s speed, angle and force.

Whether the person was restrained, and how the vehicle absorbed the impact, can also affect the outcome. These details help explain why similar crashes can lead to very different injuries.

Correll Law Firm handles car accidents, truck accidents, commercial vehicle accidents and catastrophic injuries, including spinal cord injuries, for people in Virginia. The firm’s offices are in Winchester and Harrisonburg.

Virginia generally allows two years from the date of injury to file a personal injury lawsuit (Va. Code § 8.01-243(A)); the clock runs from the date of injury, not the date of discovery, with narrow exceptions.

Virginia follows contributory negligence: if you are found even partly at fault, you may be barred from recovering, with limited exceptions. Talk to a lawyer about your facts.