Why Spinal Cord Injuries Cause Different Symptoms, A UAE Spine Surgeon Explains

Not all spinal cord injuries are the same, and not all of them produce the same symptoms. Two patients can have damage at the same level of the spine and present with completely different clinical pictures. One may have lost the ability to feel pain and temperature while retaining the ability to feel touch. Another may have weakness on one side of the body and sensory loss on the other. These patterns are not random. They are anatomically precise, and understanding them is one of the most clinically useful skills in spine neurology.

Dr. Sherief Elsayed, Consultant Spine Surgeon in Dubai, explains the spinal cord’s functional architecture in a way that makes these patterns immediately intelligible.

What the Spinal Cord Actually Does

The spinal cord is best understood as a two-way communication highway between the brain and the rest of the body. Dr. Sherief Elsayed puts it plainly: “You can think of it as a highway between the brain, which controls everything, and the rest of the body.”

Everything the brain needs to communicate to the body travels down this highway. Everything the body needs to report back to the brain travels up it. Disrupt the highway at any point and the consequences are felt both above and below that disruption.

The spinal cord carries four categories of information:

Motor commands: When you decide to move, the instruction travels from the motor cortex of the brain down through the corticospinal tracts in the spinal cord to the relevant motor nerve, which then signals the muscle. “If I want to move my right hand, the brain signals through my spinal cord to the nerve, to the muscles in my arm, in order to move my right hand,” Dr. Sherief Elsayed explains.

Proprioception: The sense of where your body parts are in space without looking at them. “Without even looking, I know that my fingers are at 90 degrees, for example. That’s called proprioception. We have receptors out there that fire back the other way to the brain, telling me what I’m doing.” This system travels in the dorsal columns, the posterior part of the spinal cord.

Sensation: Pain, temperature, vibration, and light touch are all distinct sensory modalities carried by different pathways within the cord. Pain and temperature travel in the spinothalamic tracts, which cross the midline shortly after entering the cord. Light touch travels in both the dorsal columns and the spinothalamic tracts. Vibration travels primarily in the dorsal columns.

Reflexes: “If I tap my reflex, it comes to the spinal cord and straight back to my muscle, bypassing the brain. That’s really important because it’s very quick.” Reflexes are spinal arc responses that do not require the brain’s involvement, which is why they are so fast and why they persist even when the brain’s descending control is disrupted.

Why Different Injuries Produce Different Symptom Patterns

Because different functions are carried in different anatomical locations within the spinal cord, a lesion that damages one area will spare others. This is what creates the clinically distinct patterns that an experienced clinician uses to localise an injury.

Dr. Sherief Elsayed gives a direct example: “If somebody is lacking pain and temperature, for example, they have a problem in a certain part of their spinal cord compared to somebody who’s lacking light touch, for example.”

The key anatomical points:

Pain and temperature travel in the anterior spinothalamic tract, which crosses the midline within one to two spinal segments of entry. A lesion affecting the centre of the spinal cord (central cord syndrome) will therefore affect pain and temperature sensation in the arms, as the crossing fibres at that level are disrupted, while sparing the tracts carrying sensation from the legs, which have already crossed lower down.

Vibration and proprioception travel in the posterior dorsal columns, which do not cross until they reach the brainstem. A lesion affecting only the posterior cord will produce loss of vibration and proprioception on the same side as the lesion.

This is the anatomical basis of Brown-Sequard syndrome, where damage to one half of the spinal cord produces motor weakness and loss of vibration/proprioception on the same side as the lesion, combined with loss of pain and temperature on the opposite side (because the spinothalamic fibres have already crossed).

What Reflexes Tell a Clinician About the Level of an Injury

The reflex arc, as Dr. Sherief Elsayed describes, bypasses the brain. A tendon tap sends a signal to the spinal cord, which sends it straight back to the muscle, producing the reflex jerk without any conscious involvement. This circuit is entirely within the spinal cord at the specific level being tested.

This matters clinically because reflexes behave differently depending on whether the damage is in the spinal cord itself (upper motor neurone injury) or in the peripheral nerve that leaves the cord (lower motor neurone injury).

Upper motor neurone signs occur when the damage is in the spinal cord or brain, above the point where the reflex arc exits. Because the descending pathways from the brain normally exert an inhibitory dampening effect on reflexes, damaging these pathways releases that inhibition. The result is hyperreflexia – reflexes that are exaggerated, brisk, and may spread to adjacent muscles.

Dr. Sherief Elsayed explains this directly: “If on the other hand I have something called hyperreflexia, my reflexes are super quick, that means that the dampening response of the brain is reduced and that suggests what we call an upper motor neurone lesion.”

The Babinski sign – where stroking the outer sole of the foot causes the big toe to extend upward rather than curl downward – is another upper motor neurone sign that reflects the loss of descending inhibition.

Lower motor neurone signs occur when the damage is at the level of the spinal cord nerve cell itself, in the nerve root, or in the peripheral nerve. Without an intact reflex arc, the reflex is absent or reduced. The muscle supplied by that nerve becomes weak, wasted, and develops abnormal spontaneous electrical activity (fasciculations).

The distinction between upper and lower motor neurone signs is one of the most practically important in clinical neurology because it points the clinician toward fundamentally different anatomical locations for the underlying problem.

Incomplete vs Complete Spinal Cord Injury

Spinal cord injuries are classified as complete or incomplete depending on whether any function is preserved below the level of injury.

In a complete injury, no motor or sensory function is preserved more than three segments below the level of the lesion. In an incomplete injury, some function is preserved. The pattern of preserved function reveals which spinal cord tracts are still intact.

Common incomplete injury syndromes:

Central cord syndrome: The most common incomplete injury, particularly in older patients with pre-existing cervical spondylosis who sustain a hyperextension injury. Arm weakness is greater than leg weakness, and there is typically bladder dysfunction. Sensory loss below the injury level is variable. The central location of the injury disproportionately affects the arm fibres, which are located more centrally in the corticospinal tracts.

Anterior cord syndrome: Damage to the anterior two-thirds of the cord produces loss of motor function and loss of pain and temperature sensation below the injury, while vibration and proprioception (carried in the posterior dorsal columns) are preserved.

Posterior cord syndrome: Rare. Damage to the dorsal columns produces loss of vibration and proprioception with relative preservation of motor function and pain/temperature sensation.

Brown-Sequard syndrome: Hemisection of the cord, most commonly from penetrating injury or a laterally placed disc herniation. Motor loss and dorsal column loss ipsilateral to the lesion, spinothalamic loss contralateral.

Understanding these patterns is directly clinically applicable. A Spinal Cord Surgeon in Dubai who identifies the specific syndrome at presentation can predict the likely anatomical level and nature of the injury before imaging is reviewed and can direct the most appropriate investigation and management.

How This Applies to the UAE Patient Population

In Dubai and across the UAE, spinal cord injuries occur in a distinctive clinical context. Road traffic accidents, given the UAE’s high-speed road network, remain a significant cause of acute traumatic spinal cord injury. Sports injuries, particularly from water sports including jet ski accidents, are also relevant. The ageing expatriate and Emirati population contributes a significant burden of cervical myelopathy, where gradual spinal cord compression from degenerative spondylosis produces a progressive upper motor neurone syndrome that can be mistaken for other neurological conditions.

Recognising the symptom patterns that indicate spinal cord involvement, rather than peripheral nerve or musculoskeletal pathology, is essential for timely referral and management. The difference between a numb hand from a peripheral nerve compression at the wrist and a numb hand from central cord compression is not always immediately apparent without careful neurological examination. A Cervical Spine Doctor in Dubai (Cervical Spine Care – Expert Treatment in Dubai) applies exactly this clinical reasoning to distinguish these conditions.

Red Flags for Spinal Cord Involvement

Certain clinical features indicate spinal cord involvement and require prompt specialist assessment.

Seek urgent evaluation if you notice:

• Weakness in both arms or both legs simultaneously
• Loss of sensation below a defined level on the body
• Loss of bladder or bowel control alongside limb weakness or numbness
• Balance difficulty or increasing unsteadiness that is progressive
• Brisk, hyperactive reflexes in the legs, particularly with a Babinski sign
• Lhermitte’s sign – an electric shock sensation running down the spine and into the limbs when the neck is flexed forward

These features suggest either acute spinal cord compression or progressive myelopathy, and they warrant urgent imaging and specialist referral. The article Not All Sciatica Comes From a Slipped Disc explores how nerve compression patterns differ from spinal cord involvement and why distinguishing them changes management entirely.

Why Neurological Examination Matters More Than Imaging Alone

An MRI scan of the spine can show compression of the spinal cord. It cannot show the functional impact of that compression. Two patients with identical MRI findings can have dramatically different neurological deficits, depending on the efficiency of their collateral blood supply, the chronicity of the compression, and individual anatomical variation.

The neurological examination, mapping the precise distribution of weakness, reflex changes, and sensory loss, is what translates imaging anatomy into clinical reality. A Cervical Myelopathy Specialist in Dubai (Cervical Myelopathy Treatment in Dubai) applies this examination routinely in the assessment of patients with suspected cord involvement. It is the examination that confirms whether a radiological finding is causing the patient’s symptoms, and it is the examination that guides the urgency of intervention.

Dr. Sherief Elsayed’s approach is always to correlate imaging with the clinical picture. A compressed cord on MRI in a patient with no neurological signs demands careful monitoring. A compressed cord in a patient with progressive upper motor neurone signs demands urgent surgical decompression. The difference lies entirely in the clinical examination. To discuss symptoms that may suggest spinal cord involvement, consulting a UAE Spine Surgeon (Spinal Conditions – Diagnosis & Treatment in Dubai) with specialist neurological examination skills is the most direct route to an accurate assessment.

Expert Summary

The spinal cord is anatomically organised in a way that produces predictable symptom patterns when specific areas are damaged. Understanding that pain and temperature travel separately from vibration and proprioception, that reflexes indicate whether a lesion is above or below the reflex arc, and that the pattern of preserved function in an incomplete injury reveals which tracts are intact – these principles allow a skilled clinician to localise spinal cord pathology with considerable precision before imaging is performed.

Dr. Sherief Elsayed’s clinical approach places neurological examination at the centre of every spinal assessment. The scan confirms or clarifies what the examination suggests; it does not replace it.