Spinal Stenosis

CONDITIONS EXPLAINEDSpinal Stenosis

CONDITIONS EXPLAINEDSpinal Stenosis

Spinal stenosis is a condition in which the passages through which the spinal cord and its nerve roots travel. This narrowing can occur in the spinal canal impinging on the spinal cord itself, or involve the spinal neural foramina affecting the nerve roots travelling out from the spine. When either or both are narrowed, neurological symptoms manifest in the form of radiating pain, numbness, and tingling.

The lumbar vertebrae are the most commonly stenotic structures, and symptoms involve the lower extremities. The cervical vertebrae are the second most common localization, and involve the upper extremities. Finally, it is relatively rare that the thoracic vertebrae become stenotic, but in the cases they do, numbness and pain wrap around the trunk. There are many potential causes for stenosis, but the typical presentation is in the intervertebral discs.

The intervertebral discs, as the name suggests, lay between each vertebra and act as a cushion between them. These discs lose water over time, becoming more brittle and losing elasticity. This predisposes the discs to injury, in which the gel-like nucleus pulposus may bulge out from its fibrous coating and compress local structures. The nucleus releases potent inflammatory mediators due to the trauma, causing further compression.

Other possible causes of stenosis include:

  • Bone spurs
  • Congenital malformations
  • Injury to the vertebral column
  • Injury to the spinal cord itself
  • Spinal Tumors
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Detection & Diagnosis

Stenosis is detected and diagnosed using a combination of diagnostic examinations. These include:

Physical Examination
Thorough Physical Examination – Evaluation by a physician is the first step in receiving a diagnosis for back pain. A physician can often determine the level of the defect, and make an educated decision on how to proceed.
MRI
MRI or Magnetic Resonance Imaging is the modality of choice for evaluating spinal stenosis. Spinal foramina may be visualized, and softer tissues such as the intervertebral discs may be examined for injury.
X-Ray
X-rays and Computed Tomography with or without contrast are less specific modalities of diagnosis, but useful for the identification of bony spurs that may be causing obstruction. With the use of contrast dye, the spinal cord, nerves, and even malignant bodies such as tumors may also be visualized.

OUTCOMESRelated
Treatments & Procedures

In most cases, stenosis will resolve on its own with minimally invasive therapies. Surgery is typically reserved for only the most intractable cases. Some of these less invasive procedures include:

  • Lifestyle Changes such as exercise and weight loss
  • Physical Therapy may include specific stretches to reduce pain and aid in recovery, and better motions may be taught to prevent exacerbation of existing problems. In addition, strengthening core muscles helps to compensate for spinal insufficiency.
  • Medication – Several pharmacological treatments exist for the treatment of spinal stenosis, including the use of NSAIDs such as aspirin or ibuprofen, steroids for long term relief, and stronger narcotics for pain that does not respond to existing pain management. In the case of steroids, an injection is typically made at the level of the stenotic structure, limiting inflammation for months at a time and facilitating recovery.

In cases where conservative treatments are inadequate, a number of procedures exist for the alleviation of symptoms. Even so, surgery is not without its risks, and there is always the chance that the condition may prove worse following surgery. Some such procedures routinely performed include:

  • Laminotomy – In this procedure, the back of the vertebra, the lamina, is removed to reduce pressure on local structures.
  • Laminectomy – Similar to a laminotomy, but involving only the removal of a portion of the lamina.
  • Laminoplasty – Performed in cervical cases of spinal stenosis, some tissue is removed, and a metal hinge is installed to compensate for the removed portion of vertebra.
  • Percutaneous image-guided lumbar decompression – PILD is reserved for patients with spinal stenosis resulting from a thickened ligament at the back of the spine. A small incision is made, and the thickened portion may be removed to restore adequate space for the spinal cord and its nerves.
  • Minimally invasive surgery – This approach minimizes the need for spinal fusion, and limits damage to surrounding tissues allowing for faster recovery and a reduced risk of complications.
  • Fusion surgeries – Due to the removal of bone and tissues supporting vertebral stability, it is sometimes necessary to fuse vertebra to ensure structural integrity of the vertebral column. Some degree of motion is naturally lost, but typically the relief of pain makes this procedure worthwhile.
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Anterior Lumbar Interbody Fusion

Anterior Lumbar Interbody Fusion (ALIF) is a procedure performed from the anterior to fuse vertebrae into a single structure. This technique is usually favored when..

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Artificial Disc Replacement

Artificial disc replacement is a procedure with the goal of removing a painful intervertebral disc and replacing it with a prosthetic one. Spinal fusion is much more commonly performed..

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Decompression (Laminectomy)

Decompression Lumbar Laminectomy is the most common surgical procedure performed for the correction of stenosis in the back. The surgeon will remove or trim the bony lamina and a thick ligament..

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