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Laminectomy removes bone (parts of the vertebrae) and/or thickened tissue that is narrowing the spinal canal and squeezing the spinal cord and nerve roots. This procedure is done by surgically cutting into the back.
In some cases, spinal fusion (arthrodesis) may be done at the same time to help stabilize sections of the spine treated with decompressive laminectomy. Spinal fusion is major surgery, usually lasting several hours. There are different methods of spinal fusion:
In the most common method, bone is taken from elsewhere in your body or obtained from a bone bank. This bone is used to make a “bridge” between adjacent spinal bones (vertebrae). This “living” bone graft stimulates the growth of new bone.
In some cases an additional fusion method (called instrumented fusion) is performed, in which metal implants (such as rods, hooks, wires, plates, or screws) are secured to the vertebrae to hold them together until new bone grows between them.
There are a variety of specialized techniques that can be used in spinal fusion, although the basic procedure is the same. Techniques vary from what type of bone or metal implants are used to whether the surgery is done from the front (anterior) or back (posterior) of the body. The method chosen will depend on a number of factors, including your age and health condition, the location (lower back or neck [cervical]) of stenosis, the severity of nerve root pressure and associated symptoms, and the surgeon’s experience. Spinal fusion increases the possibility of complications and the recovery time after surgery.
What To Expect After Surgery
Depending on your health and the extent of the surgery, it may take several months or more before you are able to return to your normal daily activities.
Why It Is Done
Surgery for spinal stenosis is considered when:
Symptoms are so severe that you are unable to perform normal daily activities and your quality of life is affected.
The symptoms become more severe and intolerable over time.
Most spinal stenosis occurs in the lower (lumbar) back. If you have stenosis in the neck (cervical) area, your health professional may recommend surgery to prevent worsening of the condition, which can cause nerve damage and paralysis.
The decision to have surgery is not based on imaging test results alone. Even if the results of imaging tests show increased pressure on the spinal cord and spinal nerve roots, the decision to have surgery also depends on the severity of symptoms and your ability to perform normal daily activities. In some cases spinal fusion will be done at the same time to stabilize the spine. Spinal fusion might make it easier for you to move around (improve function) and relieve your pain. It can also help keep the bones from moving into positions that squeeze the spinal canal and put pressure on the spinal cord.
How Well It Works
Surgery for spinal stenosis usually is elective but may be recommended if symptoms cannot be relieved with nonsurgical treatment. In general, experts feel that surgery has good results and relieves pain in the lower extremities for people with severe symptoms of spinal stenosis who have few other serious health problems. In general, up to 80% of people are satisfied with the results of surgery for spinal stenosis.2 For people with severe symptoms, surgery usually reduces leg pain and improves walking ability.3 However, symptoms may return after several years. About 10% to 20% of people who have had surgery need to have surgery again.
Reoperation may be necessary if:
Spinal stenosis develops in another area of the spine.
An earlier surgical procedure was not effective in controlling symptoms.
Instability develops, or fusion does not occur.
Regrowth of tissue (lamina) presses on the spinal cord or spinal nerve roots.
Spinal fusion may be done at the same time as decompressive laminectomy. Spinal fusion may help to stabilize sections of the spine that have been treated with decompressive laminectomy. Some studies suggest it may also improve function over time and relieve pain.
Complications from spinal stenosis surgery may result from the impact of other existing medical problems and the severity of the spinal problem. In addition, all surgery poses risks of complications. These complications may be more serious in an older adult.
Possible complications include:
Problems from having general anesthesia.
A deep infection in the surgical wound.
A skin infection.
Blood clots in the deep leg or pelvic veins (deep vein thrombosis), which rarely travel to the lungs (pulmonary embolism).
An unstable spine (more common after multiple laminectomies are done without using spinal fusion).
Nerve injury, including weakness, numbness, or paralysis.
Tears in the fibrous tissue that covers the spinal cord and the nerve near the spinal cord, sometimes requiring reoperation.
Difficulty passing urine or loss of bladder or bowel control.
Death (rare) related to major surgery.
If you have diabetes or heart disease or are a smoker, you may be at greater risk for complications.
What To Think About
Most experts recommend that people with spinal stenosis try nonsurgical treatments before opting for surgery. People who delay their surgeries while using other treatments still have a reasonable expectation to have good results from their operations. Surgery for lumbar spinal stenosis is most likely to relieve pain if it is mostly in your legs. Surgery does not usually work as well for relieving pain that is mostly in your back.
Surgery is usually effective if you have severe leg pain and numbness and you have not been able to move around well for a long time.4 But in some cases, the symptoms return after surgery. It is also possible that nerve symptoms, including numbness and clumsiness, may not be relieved or may also return.
After a laminectomy and fusion, spinal stenosis may develop directly above or below the surgery site. Repeated surgeries for spinal stenosis increase your risk of complications and instability in the spine. Age should not be a factor in deciding whether to have decompressive laminectomy. However, if you have other medical conditions that will make this procedure and follow-up rehabilitation less successful, surgery may not be recommended.
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