Introduction: Who Needs Diagnostic Testing for Spinal Cord Injury

A spinal cord injury can happen in an instant, often resulting from a sudden, severe blow to the spine. Anyone who has experienced trauma such as a car accident, fall from height, sports injury, or violent incident should be evaluated for potential spinal cord damage if they show any signs of neurological problems. Even when the injury seems minor at first, the damage to the spinal cord can be significant and may worsen over time without proper medical attention.^[1]

Emergency medical personnel are trained to recognize the warning signs that suggest spinal cord injury. If there is any loss of movement or sensation after an accident, immediate medical attention is essential. The time between injury and treatment is a critical factor that can affect a person’s eventual outcome, so diagnostic testing should begin as soon as possible after the injury occurs.^[12]

People who should seek diagnostic evaluation include those experiencing numbness, tingling, or loss of sensation in their hands and feet, anyone with paralysis (loss of movement), pain or pressure in the head, neck, or back, weakness in any part of the body, or problems with walking. Other concerning symptoms include difficulty breathing, loss of bladder and bowel control, and changes in sexual function. Even unusual or uncomfortable positions of the spine or head after trauma warrant immediate medical evaluation.^[2]

Classic Diagnostic Methods for Spinal Cord Injury

When someone arrives at the emergency room with a suspected spinal cord injury, healthcare professionals begin with a thorough physical examination. This initial assessment involves checking for sensory function and movement, and asking detailed questions about the accident and symptoms. The medical team evaluates how well the person can feel touch and responds to gentle pinpricks across different parts of their body. They also ask the patient to move various body parts and test the strength of their muscles. This examination helps determine whether a spinal cord injury can be ruled out or whether additional diagnostic tests are needed.^[8]

If the injured person has neck pain, isn’t fully awake, shows obvious weakness, or has signs of neurological injury, emergency diagnostic imaging tests are performed right away. The most commonly used imaging techniques include several different methods, each providing unique information about the spine and spinal cord.

X-Rays

X-rays are often the first imaging test performed because they can quickly reveal damage to the bones surrounding the spinal cord, known as vertebrae. X-rays can show fractures, tumors, or changes in the alignment of the spine. While X-rays are excellent for visualizing bone structures, they don’t provide detailed images of the soft tissues like the spinal cord itself or the discs between the vertebrae.^[8]

CT Scans

A CT scan (computed tomography scan) provides much clearer and more detailed images than a standard X-ray. This imaging technique uses computers to create a series of cross-sectional images that can show bone, disc, and other structural changes in fine detail. CT scans are particularly useful for identifying bone fragments, fractures, or areas where the spine may be compressed. The detailed images help doctors understand the extent of damage to the bony structures protecting the spinal cord.^[8]

MRI Scans

An MRI (magnetic resonance imaging) scan uses a strong magnetic field and radio waves to produce computer-generated images of the body’s internal structures. MRI is especially valuable for examining the spinal cord itself because it provides excellent visualization of soft tissues. This test can reveal herniated discs, blood clots, or other masses that might be compressing the spinal cord. MRI scans are often performed a few days after the initial injury, once some of the swelling has decreased, to get a clearer picture of the damage.^[8]

Neurological Examination

A comprehensive neurological examination is typically performed a few days after the injury when some swelling may have subsided. This detailed assessment looks at the level and completeness of the injury by testing muscle strength throughout the body and checking the ability to sense light touch and pinprick sensations in different areas. The neurological exam helps doctors classify the injury as either complete or incomplete.^[8]

In a complete injury, there is no nerve communication below the injury site, meaning the person loses all muscle control, feeling, and function below that level. An incomplete injury means the spinal cord can still send some messages to and from the brain, and the person retains some feeling, function, or muscle control below the injury site. The extent of movement or sensation retained depends on the specific location and severity of the spinal cord damage.^[2]

Understanding Injury Levels and Classifications

Doctors use a specific system to identify where along the spinal cord the injury occurred. The spinal cord has 31 segments that correspond to different regions: cervical (neck), thoracic (upper and mid-back), lumbar (lower back), and sacral (lowest portion). Each segment is designated by a letter-number combination. For example, C8 refers to the eighth segment of the cervical spinal cord.^[3]

The location of the injury determines which parts of the body will be affected. Injuries near the top of the spine, particularly in the cervical region, result in more extensive disability because they affect more of the body. An injury to the upper part of the spinal cord can cause tetraplegia (also called quadriplegia), which means paralysis affecting most of the body including all four limbs. An injury lower down may cause paraplegia, where only the lower body and legs are affected while arm function remains intact.^[4]

Recovery potential can sometimes be estimated based on early diagnostic findings. If a person recovers some movement or sensation within one week of injury, this usually indicates a good chance of recovering more function, although this process may take six months or longer. However, losses that remain after six months are more likely to be permanent.^[14]

Diagnostics for Clinical Trial Qualification

When patients are being considered for enrollment in clinical trials testing new treatments for spinal cord injury, additional diagnostic assessments may be required beyond the standard clinical evaluation. Clinical trials often have specific inclusion and exclusion criteria that must be documented through careful diagnostic testing to ensure patient safety and the validity of research results.

Baseline neurological assessments are critical for clinical trial participation. These detailed examinations document the exact level of injury, the degree of motor function remaining, and the extent of sensory preservation before any experimental treatment begins. This baseline information allows researchers to measure whether the treatment produces meaningful changes over time. Patients may undergo repeated neurological testing using standardized scales that measure muscle strength, sensation, and functional abilities.^[8]

Imaging studies such as MRI scans are often repeated at specific intervals during clinical trials to monitor changes in the spinal cord structure, detect any complications, or evaluate whether experimental treatments are having the intended biological effects. Advanced imaging techniques may be used to visualize inflammation, scarring, or regeneration of nerve tissue in the spinal cord.

Some clinical trials investigating electrical stimulation therapies or other emerging treatments may use specialized diagnostic equipment to assess how well signals are traveling through the spinal cord. These assessments help determine whether a patient is likely to benefit from a particular experimental treatment and provide objective measurements of treatment effects.^[11]

Blood tests and other laboratory assessments may also be required to ensure patients don’t have underlying health conditions that could make participation in a trial unsafe or that might interfere with the experimental treatment being studied. Overall health status, kidney and liver function, and immune system markers might all be evaluated as part of the screening process for clinical trial enrollment.