Lumbar fusion surgery is
a procedure used to treat a variety of conditions of the lumbar spine (lower
back). This article will focus on minimally
invasive lumbar fusion, although open lumbar fusion incorporates some of
the same steps.
Lumbar fusion may be used to treat a
variety of conditions. These include lumbar instability, spondylolisthesis,
degenerated lumbar discs, back pain, fracture, tumor, recurrent herniated
discs, and failed back syndrome, among others. The most common levels in the
spine requiring treatment are L4-5 and L5-S1. Many patients requiring lumbar fusion surgery also have
pinched nerves from herniated discs or spinal stenosis. As a result, the
surgery is often performed in conjunction with micro lumbar discectomy or lumbar
laminectomy.
Lumbar spinal
fusion is a common technique to help patients with back pain, who have failed
non-operative treatment. Once you and your physician have decided that you need
fusion of your lumbar spine, you should realize that there are many different
ways this procedure can be done. The choice of which technique is best for you
is dependent on what is wrong with your spine. Your surgeon may have more
experience with fusion techniques from the front of the spine (anterior), the
back of the spine (posterior), or some of the newer, less invasive approaches.
These newer techniques are often called Minimally Invasive Spinal (MIS)
surgery. The goals of all these techniques remain the same, to achieve a lumbar
fusion, and lessen the patient's pain.
The most common method of spinal fusion involves the posterior
approach, with an incision along the back of the patient's spine. Often, this
procedure is used if bone spurs, thickened ligaments, or disc ruptures need to
be removed to alleviate pressure on the nerves. The fusion procedure then
involves placement of metal screws, rods and bone graft. Anterior spinal
fusions require an incision through the abdomen. After removal of the
degenerated disc, a metal cage with bone graft is usually placed between the
spinal bones (vertebral bodies). Some patients will require both front and back
procedures.
There are many new surgical techniques that are being developed to
improve the results of lumbar fusions. Minimally invasive spine surgery for
lumbar fusion is one of these newer techniques. MIS procedures have smaller
incisions, cause less trauma to the surrounding normal tissues, and hopefully
results in a faster recovery for the patient. One of these MIS techniques is a
procedure known as extreme-lateral lumbar interbody fusion (XLIF). During the
XLIF procedure the lumbar spine is approached from the side through a small
skin incision. The surgery is performed through a muscle that lies next to the
lumbar spine known as the psoas muscle.
With the XLIF procedure, approximately 2/3 of the disc can be safely
removed. After the disc is removed, an artificial graft is placed in between
the vertebrae, to allow the bones to fuse together. For a single level XLIF
procedure, the surgery can be usually be performed in about an hour. Most
patients stay in the hospital for 24 hours following the procedure, and do not
require a brace. Occasionally, weakness may be noticed while lifting your leg
after surgery. This psoas muscle weakness should return to normal fairly soon
after surgery.
Not everyone is a candidate for this surgery, once conservative
(non-operative) treatments have failed, you should consult a surgeon to see if
you are an appropriate candidate.
What are the advantages ofminimally invasive lumbar spinal fusion?
The major advantage of all of these
minimally invasive techniques is that there is less damage caused to the
surrounding tissues. Unfortunately, in traditional spinal surgery it is
necessary to cut through muscles and move them out of the way in order to reach
the spine. This can cause a large amount of pain following surgery, and it can
lengthen the recovery time. Instead of cutting and moving muscles, the
minimally invasive techniques can more gently spread through the muscles to
allow access to the spine. This is much less painful for the patient, and it
does not require as long of a recovery period for the muscle to heal.
Another
benefit of less muscle damage is less blood loss and thus a reduced need for
blood transfusions using the minimally invasive techniques. There is often less
need for narcotic pain medications following this form of surgery, and a
shorter hospital stay.
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