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The shock-absorbing discs that separate the bones in the spine are probably the most common reason for spine surgery. The disc is much like a jelly doughnut, in that there is an outside wall to the disc and a soft center. The “jelly” is the inner spongy portion of the disc, called the nucleus pulposus. Encircling the jelly nucleus are hard bands of fibrous tissue called the annulus fibrosis, or disc wall.
With age, the disc can become more brittle and susceptible to herniation or rupture. Years of strain, and poor body lifting form, can take a toll. One day, a sudden stress from lifting can cause this weakened disc to rupture, allowing the jelly center to squirt out of the disc space. This jelly contains chemicals which are extremely irritating to the nerves, which can also cause swelling.
Because the nerve roots act as telegraph lines to other parts of the body, a common complication of disc herniation is that it can cause pain that is felt in other parts of the body, like the leg. In fact, leg pain below the knee is a common herniated disc symptom. This radiating pain is called radicular pain or radiculopathy.
Your physician will request diagnostic testing to help determine the best treatment plan.
Unlike muscles which can heal somewhat quickly, a torn or degenerated disc heals more slowly. The good news is that in many cases, the pain and inflammation originating from damaged discs can be treated nonsurgically by reducing the inflammation and by strengthening the musculature surrounding the damaged disc to give it more support.
A natural byproduct of aging is the loss of resiliency in spinal discs and a greater tendency for them to herniate, especially when placed under a weighty load, like when we lift heavy objects. Additionally, some people have a family history of degenerative disc disease, which increases their own risk of developing it. When a natural disc herniates or becomes badly degenerated, it loses its shock-absorbing ability, which can narrow the space between vertebrae.
Patients with a diseased disc between L4 and L5 or between L5 and S1 (all in the lower back) that is worn out or become injured and causes back pain are candidates for the artificial disc. Other candidates include those with degenerative disc disease (DDD) whose bones (vertebrae) have moved less than 3mm. Your physician will help you determine whether or not the artificial disc is a good choice for you. Factors that will be considered include your activity level, weight, occupation and allergies.
Generally speaking, those who receive artificial disc replacements return to activity sooner than traditional fusion patients. Also, because there is no need to harvest bone from the patient’s hip, there is no discomfort or recovery associated with a second incision site. Some of the overall benefits of artificial disc surgery include:
Just as artificial hips and knees forever changed how degenerative knee and hip joints were repaired, the new artificial discs on the market promise to restore mobility to degenerative discs. But there is a lot you need to know about the pros and cons.
Most artificial disc designs have plates that attach to the vertebrae and a rotational component that fits between these fixation plates. These components are typically designed to withstand stress and rotational forces over long periods of time. Still, like any man-made material, they can be affected by wear and tear, and damage from excessive loads.
The man-made disc might wear out over 10 years and need replacement.
The load placed on the metal disc from the trunk (especially from overweight people) can accelerate wear and damage to the disc. The load place on neck discs, however, is viewed to be less.
Revision surgery to replace the damaged artificial disc in the lumbar area is viewed by most surgeons as complex. Revision surgery on artificial discs in the neck is less complex.
Risks of complications from surgeons who either have little training or experience in artificial disc.
The second issue is that replacing a damaged disc with an artificial disc can related to if the disc is in the neck or low back.
Because of the weight of the body and the rotational stress that the trunk places on discs in the lumbar (low back) area, more stress is placed on artificial discs in the lumbar area vs. the cervical (neck) area, which only supports the weight of the head. Many spine surgeons, consequently, favor artificial disc only for cervical use currently, because the benefits overall outweigh risks short-term and long-term.
Secondly, the neck area is more accessible in surgery than the front of the lumbar spine. So even if a revision surgery were required, it would be easier to do on the neck than lumbar area. All of this underscores how important it is for the patient to be well informed. You need to ask how proficient is the surgeon at artificial disc surgery. How many have they done? Are they fellowship-trained?
Herniated discs can occur as a result of a heavy strain or fall, which causes the nucleus to break through the wall of the disc and place pressure on the nerves that branch out from the spinal cord. For example, lifting a heavy object after sitting down for a long period of time can cause a disc to herniate.
Nonsurgical treatment methods are always the best option to try first. This will most likely involve working with a physical therapist who will develop a customized exercise program involving specific stretches and extension movements for you.