Spinal stenosis is a narrowing of the spaces within your spine, which can put pressure on the nerves that travel through the spine. Spinal stenosis occurs most often in the lower back and the neck.
Some people with spinal stenosis may not have symptoms. Others may experience pain, tingling, numbness and muscle weakness. Symptoms can worsen over time.
Spinal stenosis is most commonly caused by wear-and-tear changes in the spine related to osteoarthritis. In severe cases of spinal stenosis, doctors may recommend surgery to create additional space for the spinal cord or nerves.
TYPES OF SPINAL STENOSIS
The types of spinal stenosis are classified according to where on the spine the condition occurs. It's possible to have more than one type. The two main types of spinal stenosis are:
In this condition, the narrowing occurs in the part of the spine in your neck.
In this condition, the narrowing occurs in the part of the spine in your lower back. It's the most common form of spinal stenosis.
SPINAL DISC ANATOMY
Many people have evidence of spinal stenosis on an MRI or CT scan but may not have symptoms. When they do occur, they often start gradually and worsen over time. Symptoms vary depending on the location of the stenosis and which nerves are affected.
In the neck (cervical spine)
Numbness or tingling in a hand, arm, foot or leg
Weakness in a hand, arm, foot or leg
Problems with walking and balance
In severe cases, bowel or bladder dysfunction (urinary urgency and incontinence)
In the lower back (lumbar spine)
Numbness or tingling in a foot or leg
Weakness in a foot or leg
Pain or cramping in one or both legs when you stand for long periods of time or when you walk, which usually eases when you bend forward or sit
The backbone (spine) runs from your neck to your lower back. The bones of your spine form a spinal canal, which protects your spinal cord (nerves).
Some people are born with a small spinal canal. But most spinal stenosis occurs when something happens to narrow the open space within the spine. Causes of spinal stenosis may include:
Overgrowth of bone. Wear and tear damage from osteoarthritis on your spinal bones can prompt the formation of bone spurs, which can grow into the spinal canal. Paget's disease, a bone disease that usually affects adults, also can cause bone overgrowth in the spine.
The soft cushions that act as shock absorbers between your vertebrae tend to dry out with age. Cracks in a disk's exterior may allow some of the soft inner material to escape and press on the spinal cord or nerves.
The tough cords that help hold the bones of your spine together can become stiff and thickened over time. These thickened ligaments can bulge into the spinal canal.
Abnormal growths can form inside the spinal cord, within the membranes that cover the spinal cord or in the space between the spinal cord and vertebrae. These are uncommon and identifiable on spine imaging with an MRI or CT.
Car accidents and other trauma can cause dislocations or fractures of one or more vertebrae. Displaced bone from a spinal fracture may damage the contents of the spinal canal. Swelling of nearby tissue immediately after back surgery also can put pressure on the spinal cord or nerves.
Treatment for spinal stenosis depends on the location of the stenosis and the severity of your signs and symptoms.
Talk to your doctor about the treatment that's best for your situation. If your symptoms are mild or you aren't experiencing any, your doctor may monitor your condition with regular follow-up appointments. He or she may offer some self-care tips that you can do at home. If these don't help, he or she may recommend medications or physical therapy. Surgery may be an option if other treatments haven't helped.
Pain relievers. Pain medications such as ibuprofen (Advil, Motrin IB, others), naproxen (Aleve, others) and acetaminophen (Tylenol, others) may be used temporarily to ease the discomfort of spinal stenosis. They are typically recommended for a short time only, as there's little evidence of benefit from long-term use.
Nightly doses of tricyclic antidepressants, such as amitriptyline, can help ease chronic pain.
Some anti-seizure drugs, such as gabapentin (Neurontin) and pregabalin (Lyrica), are used to reduce pain caused by damaged nerves.
Drugs that contain codeine-related drugs such as oxycodone (Oxycontin, Roxicodone) and hydrocodone (Norco, Vicodin) may be useful for short-term pain relief. Opioids may also be considered cautiously for long-term treatment. But they carry the risk of serious side effects, including becoming habit forming.
It's common for people who have spinal stenosis to become less active, in an effort to reduce pain. But that can lead to muscle weakness, which can result in more pain. A physical therapist can teach you exercises that may help:
Build up your strength and endurance
Maintain the flexibility and stability of your spine
Improve your balance
Your nerve roots may become irritated and swollen at the spots where they are being pinched. While injecting a steroid medication (corticosteroid) into the space around impingement won't fix the stenosis, it can help reduce the inflammation and relieve some of the pain.
Steroid injections don't work for everyone. And repeated steroid injections can weaken nearby bones and connective tissue, so you can only get these injections a few times a year.
With this procedure, needle-like instruments are used to remove a portion of a thickened ligament in the back of the spinal column to increase spinal canal space and remove nerve root impingement. Only patients with lumbar spinal stenosis and a thickened ligament are eligible for this type of decompression.
The procedure is called percutaneous image-guided lumbar decompression (PILD). It has also been called minimally invasive lumbar decompression (MILD), but to avoid confusion with minimally invasive surgical procedures, doctors have adopted the term PILD.
Because PILD is performed without general anesthesia, it may be an option for some people with high surgical risks from other medical problems.
Surgery may be considered if other treatments haven't helped or if you're disabled by your symptoms. The goals of surgery include relieving the pressure on your spinal cord or nerve roots by creating more space within the spinal canal. Surgery to decompress the area of stenosis is the most definitive way to try to resolve symptoms of spinal stenosis.
Research shows that spine surgeries result in fewer complications when done by highly experienced surgeons. Don't hesitate to ask about your surgeon's experience with spinal stenosis surgery. If you have any doubts, get a second opinion.
Examples of surgical procedures to treat spinal stenosis include:
This procedure removes the back part (lamina) of the affected vertebra. A laminectomy is sometimes called decompression surgery because it eases the pressure on the nerves by creating more space around them.
In some cases, that vertebra may need to be linked to adjoining vertebrae with metal hardware and a bone graft (spinal fusion) to maintain the spine's strength.
This procedure removes only a portion of the lamina, typically carving a hole just big enough to relieve the pressure in a particular spot.
This procedure is performed only on the vertebrae in the neck (cervical spine). It opens up the space within the spinal canal by creating a hinge on the lamina. Metal hardware bridges the gap in the opened section of the spine.
MINIMALLY INVASIVE SURGERY.
This approach to surgery removes bone or lamina in a way that reduces the damage to nearby healthy tissue. This results in less need to do fusions.
While fusions are a useful way to stabilize the spine and reduce pain, by avoiding them you can reduce potential risks, such as post-surgical pain and inflammation and disease in nearby sections of the spine. In addition to reducing the need for spinal fusion, a minimally invasive approach to surgery has been shown to result in a shorter recovery time.
In most cases, these space-creating operations help reduce spinal stenosis symptoms. But some people's symptoms stay the same or get worse after surgery. Other surgical risks include infection, a tear in the membrane that covers the spinal cord, a blood clot in a leg vein and neurological deterioration.
POTENTIAL FUTURE TREATMENTS
Clinical trials are underway to test the use of stem cells to treat degenerative spinal disease, an approach sometimes called regenerative medicine. Genomic medicine trials are also being done, which could result in new gene therapies for spinal stenosis.
Integrative medicine and alternative therapies may be used with conventional treatments to help you cope with spinal stenosis pain. Examples include:
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