What is Foraminal Stenosis?

Foraminal stenosis refers to narrowing of the neural foramen—the small openings on each side of the spine where nerves exit the spinal canal.

When these openings become narrowed, the exiting nerve root can become compressed, leading to pain and neurological symptoms.

 

What Causes Foraminal Stenosis?

Foraminal stenosis can occur due to a variety of degenerative or structural changes, including:

• Herniated disc: Disc material can protrude into the foramen and directly compress the exiting nerve
• Facet joint arthritis: Enlargement of the facet joints can narrow the space
• Disc height loss: As discs degenerate and collapse, the foraminal space decreases
• Bone spurs (osteophytes): Can further contribute to narrowing

In many cases, more than one factor is involved.

 

Symptoms

Symptoms are typically related to compression of a specific exiting nerve root and may include:

• Radiating pain along the course of the nerve
  • Arm pain (cervical spine)
  • Leg pain (lumbar spine)
• Numbness or tingling
• Muscle weakness in the distribution of the affected nerve

Symptoms are often unilateral and can worsen with certain positions or activities.

 

How is it Diagnosed?

Diagnosis is based on:

• Clinical symptoms and physical exam
• MRI to visualize nerve compression
• CT scan in selected cases to better evaluate bony anatomy

Imaging typically shows narrowing of the neural foramen with direct impingement on the exiting nerve.

 

Treatment Options

Conservative Management

We almost always begin with non-surgical treatment, unless there is significant or progressive weakness.

This may include:

• Physical therapy
• Activity modification
• Medications
• Targeted injections (such as foraminal or epidural steroid injections)

Many patients experience improvement with these measures.

 

Surgical Treatment

If symptoms persist or neurological deficits develop, surgery may be considered.

Treatment depends on the location and cause of compression:

• Minimally invasive or endoscopic decompression:
  In selected cases—such as a far lateral disc herniation—we can use targeted, minimally invasive or endoscopic techniques to remove the compressive disc fragment and relieve the nerve
• Traditional decompression:
  Removal of bone or soft tissue compressing the nerve through a standard approach
• Decompression with fusion:
  In cases where there is associated instability, significant degeneration, or structural compromise, a fusion procedure may be recommended to stabilize the spine

 

Our Approach

We take a stepwise and individualized approach to foraminal stenosis.

Our priority is to begin with conservative management whenever appropriate. When surgery is indicated, we tailor the approach based on the underlying cause and anatomy.

Whenever possible, we utilize minimally invasive and endoscopic techniques to directly target the source of nerve compression while minimizing tissue disruption. In more complex cases, we carefully select the appropriate decompression and/or fusion strategy to achieve durable symptom relief.

View the approach