Surgical Procedures for Low Back Pain and Sciatica
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Surgery may be indicated for persistent back pain that involves an anatomical problem such as a herniated disc , spinal stenosis , or spondylolisthesis. Rarely, surgery may be performed on an emergency basis if there are severe symptoms, such as loss of bowel or bladder control, or if a tumor is present.
The two main surgical options for treating a herniated disc are laminectomy (with or without spinal fusion) and diskectomy. Spinal decompression may be done to treat spinal stenosis. Spondylolisthesis is treated either with a fusion or with a fusion and a decompression.
Laminectomy (Spinal Decompression)
A laminectomy, also called spinal decompression, is an open surgical procedure that involves removing a small portion of bone in the spine, called the lamina, in order to alleviate pressure on spinal nerves. Along with bone, fragments of a ruptured disc may also be removed during surgery.
The surgeon makes an incision in the back, spreads the overlying muscles, and removes the lamina, which is the small part of the vertebral bone over the area where the nerve is being pinched. Once the bone is removed, the surgeon can see what is compressing the nerve and may remove the offending disc. The incision is closed with stitches or staples.
Spinal fusion is a procedure that joins two bones (vertebrae) in the spinal column together to eliminate pain caused by movement.
Most of the time when a patient has a laminectomy and disc removal, a spinal fusion is not done. If a spinal fusion is to be performed, the adjacent vertebral bones are joined together with bone harvested either from the patient or a bone donor bank. Additional internal devices, such as metal rods and pins, may be used to provide further stability. The actual "fusing" of the vertebral segments occurs as the body stimulates new bone growth between the vertebrae over the course of the healing period, which can last 3 to 6 months or even longer.
Diskectomy is the removal of the protruding disc and part of the backbone. The doctor makes an incision in the back, then a small part of the bone is removed to obtain access to the disc. The disc is then removed to take pressure off the nerve.
In certain cases, the doctor can perform a microdiskectomy to remove a herniated disc. A microdiskectomy is a less invasive procedure. The doctor makes a smaller incision and uses a magnifying instrument to visualize the disc and nerves. It is not always possible to do a microdiskectomy.
In a recent trial, 283 patients with severe sciatica for 6-12 weeks were randomly assigned to receive early microdiskectomy (within an average of 2.2 weeks) or conservative treatment (ie, combination of rest, physical therapy, and medications) with delayed surgery if necessary. Although after one year there was no difference in pain or disability between the two groups, those patients receiving early surgery reported significantly faster recovery. It is important to note that these findings do not necessarily apply to other surgical procedures like laminectomy, only microdiskectomy. *
A relatively new procedure, disc replacement is now available as an alternative to fusion when the cause of the injury is a degenerated disc. In the procedure, an artificial disc is used to replace the damaged disc, much as artificial knee joints are used to replace severely damaged knee joints. It offers the ability to repair the damaged portion of the vertebra while still maintaining the mobility of the spine. Patients with multiple degenerating discs or who have had multiple failed back surgeries may not be candidates for articicial disc replacement.
Nucleoplasty is one of the newer, less-invasive surgical procedures. This procedure uses radio waves to treat patients with low back pain caused by a contained or mildly-herniated disc. In nucleoplasty, the surgeon inserts a wand-like transmitter into the disc while the patient is awake but lightly sedated. Guided by x-ray imaging, the surgeon sends radiofrequency pulses into the nucleus or center of the disc. The radiofrequency energy heats and shrinks the gel-like tissue, resulting in less volume and thus relieving pressure on the nerve impacted by the bulging disc. The entire procedure lasts about 30 minutes.
American Academy of Orthopaedic Surgeons website. Available at: http://www.aaos.org/ .
Conn's Current Therapy 2001. 53rd ed. WB Saunders Company; 2001.
National Institute of Neurological Disorders and Stroke website. Available at: http://www.ninds.nih.gov/ .
Textbook of Primary Care Medicine. 3rd ed. Mosby, Inc.; 2001.
Updated Disketomy section on 6/7/2007 according to the following study, as cited by DynaMed's Systematic Literature Surveillance : Peul WC, van Houwelingen HC, van den Hout WB, et al. Surgery versus prolonged conservative treatment for sciatica. N Engl J Med. 2007;356:2245-2256.
Last reviewed February 2007 by Barbara Harty-Golder, MD, JD
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