The lumbar spine can be affected by various conditions that impact mobility and quality of life. One of the most common is lumbar spinal stenosis, a condition that can compromise the proper functioning of the nerves in this area.

What is lumbar spinal stenosis and why does it compress the nerves?

Lumbar spinal stenosis is a condition in which the space within the spinal column gradually narrows. This narrowing is usually related to degenerative changes associated with aging, although it can also occur due to other spinal disorders.

As the spinal canal narrows, the nerve structures that pass through this area have less room to maneuver. As a result, nerve compression can occur, leading to various symptoms in the back, buttocks, or legs.

What happens to the spine when the lumbar canal narrows?

When the spinal canal narrows, the nerves that run along the lower spine are subjected to increased pressure. This can be due to enlarged joints, thickened ligaments, or degeneration of the intervertebral discs.

The reduction in available space hinders the normal functioning of nerve structures and can alter the transmission of signals between the spine and the lower extremities.

What is the difference between lumbar stenosis, herniated disc, and sciatica?

Although they can cause similar symptoms, lumbar stenosis, herniated disc, and sciatica are not the same:

• Lumbar spinal stenosis: consists of a narrowing of the spinal canal that reduces the space available for the nerves.
• Herniated disc: occurs when part of the intervertebral disc shifts and can compress a nerve root.
• Sciatica: This refers to pain that radiates along the path of the sciatic nerve. It is a symptom that can be caused by a herniated disc, lumbar spinal stenosis, or other conditions.

What symptoms does lumbar spinal stenosis cause in the legs and back?

Symptoms can vary depending on the degree of narrowing and the nerves affected. The most common symptoms include:

• Pain in the lower back.
• Pain that extends to the buttocks, thighs, or legs.
• Feeling of fatigue in the lower limbs when walking.
• Tingling or numbness in the legs.
• Muscle weakness in one or both limbs.
• Need to stop frequently while walking due to discomfort.

Why does lumbar stenosis cause pain when walking and improve when sitting?

When walking or standing, the lumbar spine tends to extend slightly, which can further reduce the space available for the nerves. This can lead to pain, heaviness, or a feeling of fatigue in the legs after walking a certain distance.

When you sit or lean forward, the lumbar spine often gains some space, and the pressure on the nerve structures decreases. For this reason, many people experience relief when resting or adopting these postures.

What signs indicate loss of strength, tingling, or numbness due to stenosis?

Prolonged nerve compression can alter sensation and muscle function in the lower extremities. Some signs that may appear include:

• Loss of strength: difficulty lifting the foot, climbing stairs, or maintaining the same performance while walking.
• Tingling: a sensation of prickling, electric shock or tickling that spreads through one or both legs.
• Numbness: decreased sensitivity or a feeling of numbness in certain areas of the leg or foot.

How is lumbar spinal stenosis diagnosed using imaging tests?

The diagnosis combines clinical assessment with various imaging tests that allow observation of the spine's condition and detection of potential areas of narrowing. The most commonly used are:

• Lumbar X-ray: allows evaluation of spinal alignment and detection of signs of wear or instability.
• Magnetic resonance imaging: provides a detailed view of the nerves, discs, ligaments and the degree of narrowing of the lumbar canal.
• Computed tomography (CT): provides accurate information about bone structures when a more detailed study is required.
• CT scan with myelography: can be used in specific situations when MRI is not possible or does not provide sufficient information.

When does an MRI confirm the cause of lower back pain?

Magnetic resonance imaging (MRI) is usually the gold standard test for confirming the presence of lumbar spinal stenosis. It allows identification of the affected level, assessment of the degree of narrowing, and verification of whether there is compression of nerve structures.

However, MRI findings should be interpreted in conjunction with symptoms and physical examination. The presence of changes on the image alone does not always explain the cause of the discomfort.

What data from the examination help to assess the severity of the stenosis?

The physical examination provides relevant information to understand how the stenosis is affecting nerve function and the person's functional capacity. Aspects typically evaluated include:

• Distance that can be covered on foot before discomfort appears.
• Presence of pain, heaviness or tiredness in the legs.
• Muscle strength in the lower limbs.
• Alterations in sensitivity.
• Neurological reflexes.
• Balance and stability during walking.
• Changes in symptoms depending on the posture adopted.

What questions should you bring to the appointment if you have lumbar spinal stenosis?

Preparing some questions before the consultation can help you better understand the diagnosis and possible treatment options:

• What degree of stenosis is present in the lumbar spinal canal?
• Which nerves are affected?
• Do the symptoms correspond with the findings of the imaging tests?
• What treatment might be most appropriate in each case?
• Which activities should be limited or adapted?
• What signs indicate that the condition is progressing?
• When might it be necessary to consider surgical intervention?

What treatments are available for lumbar spinal stenosis?

Treatment for lumbar spinal stenosis depends on the severity of symptoms, the degree of nerve involvement, and the impact the condition has on daily life. Treatment options may include conservative measures or procedures aimed at relieving nerve compression.

When is physiotherapy, medication, or injections recommended for stenosis?

Conservative measures are often the first step in many cases of lumbar spinal stenosis. Among the most commonly used options are:

• Physiotherapy: helps improve mobility, strengthen supporting muscles and promote better spinal function.
• Medication: may be used to control pain and reduce inflammation when symptoms limit daily activities.
• Injections: These are considered when discomfort persists despite conservative treatment or when more localized relief of inflammation around the nerves is sought.

When is endoscopic surgery considered to release the nerves?

Surgery may be considered when symptoms are persistent, significantly limit the ability to walk or perform usual activities, or when there is progressive neurological impairment.

Endoscopic techniques allow access to the affected area through small incisions to decompress the nerves and create space within the lumbar spinal canal. The indication for this procedure should be individualized after a complete clinical and radiological evaluation.

What is the recovery like after treatment for lumbar stenosis?

Recovery varies depending on the treatment received, the person's overall health, and the severity of their previous condition. In many cases, symptom improvement occurs gradually over the weeks following treatment.

Following an intervention, a gradual return to normal activities is usually recommended, accompanied by specific mobility and rehabilitation guidelines when necessary.

The team of Prof. Dr. Elgeadi He specializes in the diagnosis and treatment of spinal pathologies using advanced and minimally invasive techniques. If you experience compatible symptoms, book an appointment for an assessment.