A spinal cord injury can change nearly every aspect of a person’s life, affecting movement, sensation, independence, employment, and long-term medical needs. But not all spinal cord injuries are the same.

One of the most important distinctions doctors make is whether an injury is complete or incomplete.

In general, a complete spinal cord injury results in no preserved sensory or motor function below the neurological level of the injury, while an incomplete spinal cord injury leaves at least some nerve pathways functioning. That means a person with an incomplete injury may retain some sensation, movement, or both below the affected area.

The distinction can influence rehabilitation, prognosis, medical care, and the long-term impact of an injury.

Table of Contents

Quick Highlights

  • A complete spinal cord injury generally means there is no preserved motor or sensory function below the injury, including the lowest sacral segments used in neurological classification.
  • An incomplete spinal cord injury means some sensory or motor function remains below the level of injury.
  • A complete injury does not necessarily mean the spinal cord was physically severed.
  • Severe trauma, compression, swelling, bleeding, or loss of blood supply can disrupt nerve communication even when the cord remains physically intact.
  • With an incomplete injury, some nerve pathways remain capable of transmitting messages between the brain and the body.
  • Two people with spinal cord injuries at the same level can have very different abilities and limitations.
  • Spinal cord injuries can affect far more than movement, including bowel and bladder function, breathing, sexual function, sensation, and chronic pain.
  • Serious spinal cord injuries can require extensive rehabilitation, assistive equipment, home modifications, ongoing medical treatment, and long-term personal care.
  • When a spinal cord injury is caused by another person or company’s negligence, the injured person may be able to pursue compensation for both current and future losses.

What Is a Spinal Cord Injury?

The spinal cord is a bundle of nerve tissue that runs from the brain through the spinal canal. Along with the brain, it forms the central nervous system.

Its job is to carry messages between the brain and the rest of the body.

Those messages help control functions such as:

  • Movement
  • Touch and sensation
  • Temperature perception
  • Pain perception
  • Reflexes
  • Bowel and bladder function
  • Sexual function
  • Breathing and other bodily functions

When trauma damages the spinal cord, communication between the brain and parts of the body below the injury may be disrupted.

The National Institute of Neurological Disorders and Stroke explains that spinal cord injuries can cause symptoms including paralysis, weakness, altered sensation, pain, loss of bowel or bladder control, difficulty walking, breathing problems, and changes in sexual function.

The severity and location of the injury determine much of its effect on the body.

Illustration of one spine with a split cord comparing complete vs incomplete spinal cord injuries

Complete vs incomplete spinal cord injuries at a glance (Source: ASIA classification standards).

What Is a Complete Spinal Cord Injury?

A complete spinal cord injury is one in which there is no preserved sensory or motor function in the lowest sacral segments used to classify spinal cord injuries.

In practical terms, that generally means nerve signals cannot effectively travel through the injured area to produce voluntary movement or conscious sensation below the neurological level of injury.

A common misconception is that a “complete” injury means the spinal cord must have been completely cut or severed.

That is not necessarily true.

A person can have a functionally complete spinal cord injury even though portions of the cord remain anatomically intact.

Severe trauma may cause:

  • Crushing or compression of the spinal cord
  • Significant swelling
  • Bleeding in or around the cord
  • Disruption of blood supply
  • Damage to nerve fibers
  • Destruction of microscopic pathways responsible for carrying signals

The Christopher & Dana Reeve Foundation notes that even with a complete injury, some nerve fibers or axons may remain physically intact. They simply may no longer function adequately to carry useful signals through the injured region.

That is why the terms “complete” and “incomplete” refer primarily to neurological function, not whether someone could literally see a physical break in the spinal cord on an imaging study.

What Is an Incomplete Spinal Cord Injury?

An incomplete spinal cord injury occurs when some sensory or motor function remains below the neurological level of injury.

In other words, at least some nerve pathways continue to carry signals through the damaged portion of the spinal cord.

A person with an incomplete injury might retain:

  • Some feeling below the injury
  • Limited voluntary movement
  • Movement on one side but not the other
  • Sensation without meaningful movement
  • Movement in certain muscle groups
  • Varying degrees of bowel or bladder function

The amount of preserved function can vary widely.

One person with an incomplete injury may be able to walk with assistance, while another may have only slight movement or limited sensation below the injury.

The term “incomplete” therefore should not be interpreted to mean “minor.”

An incomplete spinal cord injury can still result in profound and permanent disability.

Complete vs. Incomplete Spinal Cord Injury

The primary difference is the amount of neurological function preserved below the injury.

Complete Injury

A complete spinal cord injury generally involves:

  • No preserved sensory function in the relevant lowest sacral segments
  • No preserved motor function in those segments
  • Severe disruption of communication between the brain and body below the injury
  • A greater likelihood of extensive paralysis and sensory loss

Incomplete Injury

An incomplete spinal cord injury generally involves:

  • Some preserved sensory function
  • Some preserved motor function
  • Or a combination of the two

The spinal cord is still able to transmit at least some signals across the injured area.

That remaining neurological function is sometimes called sacral sparing when it involves preserved function in the lowest sacral segments.

How Do Doctors Determine Whether a Spinal Cord Injury Is Complete?

Doctors commonly use standardized neurological examinations to determine the location and severity of a spinal cord injury.

One widely used system is the International Standards for Neurological Classification of Spinal Cord Injury, developed by the American Spinal Injury Association (ASIA).

The examination evaluates factors including:

  • Muscle strength
  • Light-touch sensation
  • Pinprick sensation
  • Sensory function at different levels of the body
  • Motor function in key muscle groups
  • Function in the lowest sacral spinal segments

A major part of determining whether an injury is complete or incomplete is evaluating whether there is preserved sensory or motor function in the S4-S5 sacral segments.

If some qualifying function remains, the injury may be considered incomplete.

What Is the ASIA Impairment Scale?

The ASIA Impairment Scale, sometimes abbreviated AIS, is commonly used to describe the severity of a spinal cord injury.

It generally categorizes injuries from AIS A through AIS E.

AIS A – Complete

There is no sensory or motor function preserved in the lowest sacral segments.

AIS B – Sensory Incomplete

Some sensory function remains below the neurological level of injury, including qualifying sacral function, but motor function is not sufficiently preserved.

AIS C – Motor Incomplete

Motor function is preserved below the neurological level, but more than half of key muscles below that level have relatively limited strength.

AIS D – Motor Incomplete

Motor function remains below the injury, and at least half of key muscles below the neurological level meet a stronger muscle-grade threshold.

AIS E – Normal

Sensory and motor testing is considered normal following a prior neurological deficit.

These classifications help physicians communicate about the severity of an injury and track changes over time.

However, no classification can completely describe what an individual person will experience.

Does a Complete Spinal Cord Injury Mean the Cord Was Severed?

No.

This is one of the most common misunderstandings surrounding spinal cord injuries.

A completely severed spinal cord can cause a complete neurological injury, but many complete injuries occur without the cord being cut.

For example, a violent collision can fracture or dislocate vertebrae and severely compress the spinal cord.

The resulting trauma can damage nerve cells and axons, interrupt blood flow, trigger swelling, and create secondary injury inside the spinal cord.

Even if the cord is still physically connected, its nerve pathways may no longer transmit useful signals below the damaged area.

This distinction matters because spinal cord injury terminology describes what the nervous system can do, not simply what the spinal cord looks like.

Can an Incomplete Spinal Cord Injury Still Cause Paralysis?

Yes.

An incomplete injury does not mean the person escaped paralysis.

Someone with an incomplete spinal cord injury may experience:

  • Significant weakness
  • Partial paralysis
  • Loss of coordination
  • Difficulty standing
  • Difficulty walking
  • Limited hand or arm function
  • Reduced sensation
  • Loss of bowel or bladder control

The effects depend heavily on the location and pattern of injury.

Some people with incomplete injuries regain meaningful function with rehabilitation, while others remain dependent on wheelchairs, caregivers, or other forms of assistance.

What Are Common Types of Incomplete Spinal Cord Injuries?

Incomplete spinal cord injuries can produce several recognizable neurological patterns.

Central Cord Syndrome

Central cord syndrome commonly causes greater weakness in the arms and hands than in the legs.

It can occur when the central portion of the spinal cord is damaged, especially after trauma to the cervical spine.

Anterior Cord Syndrome

Anterior cord syndrome involves damage to the front portion of the spinal cord.

It can significantly affect motor function as well as pain and temperature sensation below the injury.

Brown-Séquard Syndrome

Brown-Séquard syndrome results from damage primarily affecting one side of the spinal cord.

A person may experience different combinations of motor and sensory loss on opposite sides of the body.

These patterns can vary considerably, and actual spinal cord injuries do not always fit neatly into one textbook category.

Why Does the Level of the Spinal Cord Injury Matter?

Whether an injury is complete or incomplete is only one part of understanding its severity.

The level of injury also matters.

Cervical Spinal Cord Injuries

Injuries to the cervical spinal cord in the neck can affect both the arms and legs and may result in tetraplegia, also known as quadriplegia.

Higher cervical injuries may also interfere with breathing.

Thoracic Spinal Cord Injuries

Thoracic injuries occur in the upper and middle back.

They commonly affect the trunk and legs while preserving arm and hand function.

Lumbar Spinal Cord Injuries

Lumbar injuries can affect the hips, legs, bowel, bladder, and sexual function.

Sacral Spinal Cord Injuries

Sacral injuries can affect the hips, buttocks, legs, feet, bowel, bladder, and sexual function.

Generally, the higher the injury occurs on the spinal cord, the more areas of the body may be affected.

Can Someone Recover From a Complete or Incomplete Spinal Cord Injury?

Recovery from a spinal cord injury varies from person to person.

Factors that may affect recovery include:

  • Whether the injury is complete or incomplete
  • The neurological level of injury
  • The mechanism and severity of trauma
  • The person’s age and overall health
  • How quickly medical treatment began
  • Whether surgical intervention was necessary
  • Complications following the injury
  • Rehabilitation and physical therapy
  • Changes in neurological function over time

Incomplete injuries generally leave more functioning nerve pathways available than complete injuries, which can create greater potential for neurological recovery.

However, no two injuries are identical.

Even patients given the same clinical classification may ultimately have different levels of movement, sensation, independence, and quality of life.

Secondary Damage After a Spinal Cord Injury

Some spinal cord damage occurs immediately during an accident.

Additional injury can develop afterward.

The initial impact may damage vertebrae, ligaments, blood vessels, nerve cells, and the spinal cord itself. In the hours and days that follow, swelling, inflammation, bleeding, reduced blood flow, and other biological processes can cause additional damage.

This is one reason suspected spinal cord injuries are medical emergencies.

Prompt stabilization and treatment may be critical to preventing additional injury and addressing life-threatening complications.

Long-Term Effects of a Serious Spinal Cord Injury

The consequences of a spinal cord injury can extend far beyond paralysis.

A person may experience lifelong complications involving:

  • Chronic pain
  • Muscle spasms
  • Pressure injuries
  • Bowel dysfunction
  • Bladder dysfunction
  • Sexual dysfunction
  • Respiratory problems
  • Blood clots
  • Loss of bone density
  • Cardiovascular complications
  • Reduced mobility
  • Need for assistive technology
  • Need for personal assistance

Some people may require years or a lifetime of ongoing care.

The Financial Impact of a Spinal Cord Injury

Spinal cord injuries are among the most financially significant injuries a person can suffer.

Expenses can include:

  • Emergency transportation
  • Hospitalization
  • Surgery
  • Intensive care
  • Rehabilitation
  • Physical therapy
  • Occupational therapy
  • Prescription medications
  • Wheelchairs and mobility equipment
  • Home modifications
  • Accessible vehicles
  • Medical supplies
  • In-home nursing or attendant care
  • Future surgeries
  • Long-term medical monitoring

The financial consequences can extend beyond medical expenses.

A person may also lose the ability to return to the same occupation, work the same number of hours, or work at all.

Family members may need to reduce their own working hours or leave jobs to provide care.

For a young person with a permanent spinal cord injury, these losses may continue for decades.

How Are Future Needs Evaluated in a Spinal Cord Injury Case?

Serious spinal cord injury cases frequently require an analysis of expenses and losses that will occur long after the legal case has ended.

Depending on the circumstances, attorneys may work with medical and financial professionals such as:

  • Physicians
  • Rehabilitation specialists
  • Life care planners
  • Vocational experts
  • Economists
  • Physical therapists
  • Occupational therapists

A life care plan, for example, may estimate the medical treatment, equipment, assistance, therapy, home modifications, and other services an injured person is reasonably expected to need throughout life.

Those future needs can represent a substantial portion of a catastrophic injury claim.

What Types of Accidents Can Cause Spinal Cord Injuries?

Spinal cord injuries can result from many types of traumatic events.

Common examples include:

The Roach Law Firm handles serious and complicated personal injury cases throughout East Texas, including claims arising from car crashes, truck accidents, dangerous premises, and other incidents involving catastrophic injuries.

Compensation After a Spinal Cord Injury Caused by Negligence

If someone else’s negligence causes a spinal cord injury, the injured person may be able to pursue compensation under Texas personal injury law.

Depending on the case, damages may include compensation for:

  • Past medical expenses
  • Future medical expenses
  • Lost wages
  • Reduced earning capacity
  • Rehabilitation expenses
  • Assistive devices
  • Home and vehicle modifications
  • Personal care needs
  • Physical pain
  • Mental anguish
  • Physical impairment
  • Disfigurement

Every spinal cord injury case is different.

A young person with a permanent injury may face decades of future medical treatment and lost earning capacity, making it important to consider long-term damages rather than only the bills that have already accumulated.

Why Spinal Cord Injury Cases Can Be Complex

Catastrophic injury cases often require extensive investigation and expert analysis.

Liability may be disputed, especially in cases involving commercial vehicles, workplaces, industrial operations, defective equipment, or multiple potentially responsible companies.

At the same time, determining damages can require estimating needs years or decades into the future.

Evidence may include:

  • Police reports
  • Accident reconstruction evidence
  • Vehicle data
  • Surveillance footage
  • Witness statements
  • Medical imaging
  • Hospital records
  • Rehabilitation records
  • Employment records
  • Expert testimony
  • Life care plans
  • Economic projections

Insurance companies may also dispute whether every limitation or future expense is related to the accident.

For these reasons, the value of a spinal cord injury case cannot usually be determined by looking only at the initial medical bills.

Talk to an East Texas Spinal Cord Injury Lawyer

The distinction between a complete and incomplete spinal cord injury can have enormous implications for a person’s mobility, independence, medical care, and future.

A complete injury generally involves the loss of motor and sensory function below the injury, while an incomplete injury leaves some neurological pathways intact. But neither label tells the entire story. The location of the injury, the amount of preserved function, complications, rehabilitation progress, and the individual’s long-term needs all matter.

When a spinal cord injury was caused by another person’s or company’s negligence, obtaining compensation that accounts for both present and future losses can be critical.

The Roach Law Firm is based in East Texas and represents people in serious and complex personal injury cases throughout communities including Tyler, Longview, Texarkana, Lufkin, Nacogdoches, Marshall, Henderson, Mount Pleasant, Daingerfield, and surrounding areas.

If you or a loved one suffered a spinal cord injury because of someone else’s negligence, contact the Roach Law Firm for a free consultation.