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Disk removal is one of the most common types of back surgery. Diskectomy (also called discectomy) is the removal of an intervertebral disk, the flexible plate that connects any two adjacent vertebrae in the spine. Intervertebral disks act as shock absorbers, protecting the brain and spinal cord from the impact produced by the body's movements.
PurposeRemoving the invertebral disk is performed after completion of unsuccessful conservative treatment for back pain that has been present for at least six weeks. Surgery is also performed if there is pressure on the lumbosacral nerve roots that causes weakness, bowel dysfunction, or bladder dysfunction.
As a person ages, the disks between vertebrae degenerate and dry out, and tears form in the fibers holding them in place. Eventually, the disk can develop a blister-like bulge, compressing nerves in the spine and causing pain. This is called a "prolapsed" (or herniated) disk. If such a disk presses on a nerve root and causes muscle weakness, or problems with the bladder or bowel, immediate disk removal surgery may be needed.
The goal of the surgery is to relieve all pressure on nerve roots by removing the pulpy material from the disk, or the entire disk. If it is necessary to remove material from several nearby vertebrae, the spine may become unsteady. In this case, the surgeon will perform a spinal fusion, removing all disks between two or more vertebrae, and roughening the bones so that the vertebrae heal together. Bone strips taken from the patient's leg or hip may be used to help hold the vertebrae together. Spinal fusion decreases pain, but decreases spinal mobility.
DescriptionThe surgery is performed under general anesthesia. The surgeon cuts an opening into the vertebral canal, and moves the dura and the bundle of nerves called the "cauda equina" (horse's tail) aside, which exposes the disk. If a portion of the disk has moved out from between the vertebrae and into the nerve canal, it is simply removed. If the disk itself has become fragmented and partially displaced, or is not fragmented but bulges extensively, the surgeon removes the damaged part of the disk and the part that lies in the space between the vertebrae.
There are minimally invasive surgical techniques for disk removal, including microdiskectomy. In this procedure, the surgeon uses a magnifying instrument or special microscope to view the disk. Magnification makes it possible to remove a herniated disk with a smaller incision, causing less damage to nearby tissue. Video-assisted arthroscopic microdiskectomy has exhibited good results with less use of narcotics and a shortened period of disability. Newer forms of diskectomy are still in the research stage, and are not yet widely available. These include laser diskectomy and automated percutaneous diskectomy.
Total disk replacement research in the United States is underway. Products under investigation include the ProDisc (made by Spine Solutions, Inc.), and the SB Charite III (made by Link Spine Group, Inc.). In these clinical studies, a significant number of patients who received artificial disk implants report a reduction in back and leg pain; 92.7% state they are satisfied or extremely satisfied with the procedure.
RisksAll surgery carries some risk due to heart and lung problems or the anesthesia itself, but this risk is generally very small. (The risk of death from general anesthesia for all types of surgery, for example, is only approximately one in 1,600 surgeries.)
The most common risk of the surgery is infection, which occurs in 1–2% of cases. Rarely, the surgery damages nerves in the lower back or major blood vessels in front of the disk. Occasionally, there may be some residual paralysis of a leg or bladder muscle after surgery, but this is the result of the disk problem that necessitated the surgery, not the operation itself.
Antonius Mathysen, a Dutch military surgeon, invented the plaster of Paris cast in 1851. Many developments in orthopedic surgery resulted from experiences during wartime. On the battlefields of the Middle Ages the injured were treated with bandages soaked in horses' blood which dried to form a stiff, but unsanitary, splint. Traction and splinting developed during World War I. The use of intramedullary rods to treat fractures of the femur and tibia was pioneered by Gerhard Küntscher of Germany. This made a noticeable difference to the speed of recovery of injured German soldiers during World War II and led to more widespread adoption of intramedullary fixation of fractures in the rest of the world. However, traction was the standard method of treating thigh bone fractures until the late 1970s when the Harborview Medical Center in Seattle group popularized intramedullary fixation without opening up the fracture. External fixation of fractures was refined by American surgeons during the Vietnam War but a major contribution was made by Gavril Abramovich Ilizarov in the USSR. He was sent, without much orthopedic training, to look after injured Russian soldiers in Siberia in the 1950s. With no equipment he was confronted with crippling conditions of unhealed, infected, and malaligned fractures. With the help of the local bicycle shop he devised ring external fixators tensioned like the spokes of a bicycle. With this equipment he achieved healing, realignment and lengthening to a degree unheard of elsewhere. His Ilizarov apparatus is still used today as one of the distraction osteogenesis methods.
David L. MacIntosh pioneered the first successful surgery for the management of the torn anterior cruciate ligament of the knee. This common and serious injury in skiers, field athletes, and dancers invariably brought an end to their athletics due to permanent joint instability. Working with injured football players, Dr. MacIntosh devised a way to re-route viable ligament from adjacent structures to preserve the strong and complex mechanics of the knee joint and restore stability. The subsequent development of ACL reconstruction surgery has allowed numerous athletes to return to the demands of sports at all levels.
Modern orthopaedic surgery and musculoskeletal research has sought to make surgery less invasive and to make implanted components better and more durable.
Neuromuscular programs have been designed to address deficits in dynamic stabilization of the knee. There are several neuromuscular programs that have been designed, most of which involve stretching, plyometrics, and strengthening. These programs "teach" the athlete how to land from a jumping position, pivot side-to-side, and move the knee without placing as much force on the ACL.
Unfortunately, this is precisely the opposite of what needs to be done. Weight-bearing exercise has been shown to have beneficial effects on maintaining healthy bone. Furthermore, fit people have better balance and are less likely to fall or fracture a bone.
While maintaining fitness is crucial, it is important to exercise safely. Contact your local senior center or physical therapist to see if any classes are offered specifically for older adults.
Knowing your bone density can help you and your doctor determine what steps are necessary to help improve your bone health and prevent fracture. Patients with lower bone density may be placed on medications to limit bone loss and improve bone density.
A 1999 survey of homes by Yale University researchers found safety problems in the vast majority of houses. Almost 80% of houses of elderly people had loose objects on living room floors. including rugs, piles of books, or loose cords. Other areas of concern were stairways, kitchens, and bathrooms.
By knowing your medications, and the signs of problems with these medications, you can take control of your health. Let your doctor know if you think a medication could be causing a side effect that may lead to unsteady walking, loss of balance, or a fall.
Many older patients have poor vision and may wear corrective lenses. But unless they check regularly with their eye doctor, they may not know if their vision has been worsening. Treating poor vision is a crucial step to avoiding falls.
Many people have known skin sensitivities to various metals. The most frequent sensitivity encountered is to inexpensive jewelry that may contain nickel. Some orthopedic implants contain small amounts of nickel, and there has been concern that this may be an issue for those individuals receiving implants who also have skin irritation from this metal.
Unfortunately, the symptoms of metal implant sensitivity and allergy are not well defined. Having a skin sensitivity to a particular metal is not thought to correlate well to
having sensitivities to implanted metals. Therefore, making the diagnosis of a sensitivity or allergy to metal implants usually requires the removal of the implant. Patients who have pain around metal implants and associated skin changes (eczema) should be evaluated for possible metal sensitivity.