Lumbar spinal stenosis is a narrowing of the spinal canal in the
lower part of your back. Stenosis can cause pressure on your
spinal cord or the nerves that go from your spinal cord to your
muscles.
Causes
The most common cause of spinal stenosis is osteoarthritis. This is the gradual wear
and tear that happens to your joints over time. Spinal stenosis is common because
osteoarthritis begins to cause changes in most people’s spine by age 50. That's why
most people who develop symptoms of spinal stenosis are 50 or older. Some people
are also born with a spinal canal that may be narrower than other people's.
Besides osteoarthritis, other conditions or things can cause spinal stenosis:
• Narrow spinal canal
• Injury to the spine
• Spinal tumor
• Certain bone diseases
• Past surgery of the spine
• Rheumatoid arthritis
• Herniated disk
Symptoms
Early lumbar spinal stenosis may have no symptoms. In most people, symptoms
develop slowly over time. Symptoms may include:
• Back pain
• Burning pain going into the buttocks and down into the legs (sciatica)
• Numbness, tingling, cramping, or weakness in the legs
• Loss of sensation in the feet
• A weakness in a foot that causes the foot to slap down when walking.
This is also called foot drop.
• Loss of sexual ability
Pressure on nerves in the lumbar region can also cause more serious symptoms
known as cauda equina syndrome. If you have any of these symptoms, you need to
get medical care right away:
• Loss of bowel or bladder control
• Severe or increasing numbness between your legs, inner thighs, and
back of the legs
• Severe pain and weakness that spreads into one or both legs. This
makes it hard to walk or get out of a chair.
Diagnosis
To diagnose lumbar spinal stenosis, your healthcare provider will ask you questions
about your symptoms and do a complete physical exam. During the physical exam,
your provider will look for signs of spinal stenosis. These include loss of sensation,
weakness, and abnormal reflexes.
These tests help make a diagnosis:
• X-rays of your lumbar spine. These may show bone growths called
spurs that push on spinal nerves, a narrowing of the spinal canal, or both.
• Imaging tests. A CT scan or MRI scan can give a more detailed look at
the spinal canal and nerve structures.
• Other studies. You may need a bone scan, a CT taken after injecting dye
into the spinal canal (myelogram), nerve conduction studies, and
electromyography, an electrical test of muscle activity.
Treatment
If you have lumbar spinal stenosis, many types of healthcare professionals can help
you, such as arthritis specialists, nerve specialists, surgeons, and physical therapists.
Treatment can include physical therapy, medicine, and sometimes surgery. Except in
emergencies, such as cauda equina syndrome, surgery is often the last resort.
• Physical therapy may include exercises to strengthen your back,
stomach, and leg muscles. Learning how to do activities safely, using braces to
support your back, stretching, and massage may also be helpful.
• Medicines may include nonsteroidal anti-inflammatory drugs that relieve
pain and swelling, and steroid injections that reduce swelling. Medicines that
treat nerve pain or muscle spasm may also be helpful.
• Surgery includes removing bone spurs and widening the space between
vertebrae (laminectomy). The lower back may also be stabilized by fusing
together some of the vertebrae. In some cases, fusion is used along with
decompression. Decompression is easing the pressure on the nerves.
The information provided here is for general educational purposes
only. For specific advice regarding back pain treatment, please book
an appointment with our surgeon.
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