A discogram refers to injecting a dye into your spine and then taking X-ray pictures of the discs in the spine. In order to clearly see the discs, the doctor injects a dye into the center of the injured disc(s). Upon the doctor examining the pictures, the discs will appear visible on X-ray film and on a fluoroscope (special X-ray TV screen.
Why use a Discogram?
This test will determine which disc has structural damage and where the pain originates from. If a disc has begun to rupture and if it has tears in the tough outer ring (the annulus), a discogram will identify these problems. Also, by injecting fluid into the disc to increase pressure, the doctor can tell if it generates pain.
Normal discs, and even those that are severely degenerated, do not usually cause pain. Prior to surgery, a discogram helps the doctor know the location of the problem and the type of operation needed.
How is it done?
Prior to the operation, medication will help you relax. Then the doctor will apply a local anesthetic to numb the area of the back. When the area is numbed, the doctor injects the dye into the nucleus pulposus (the very center of the intervertebral disc). Most importantly, the doctor uses a fluoroscope to see your spine and the needle as it is inserted into the correct disc space. Then X-rays and a CT scan take pictures to see a cross-section of the disc. The procedure lasts about 40 minutes
In addition, once the needle is inside the damaged disc, a small amount of fluid is injected to increase pressure on the disc. If this test causes pain that is similar to your back or leg pain, it is a good indication that the disc causes the pain.
Limitations of a Discogram?
Unfortunately, the discogram does not show the bones or nerves very well-only inside of the intervertebral disc. This test is not frequently used; however, if an MRI fails to find a problem disc doctors will recommend it. . Doctors also rely on the discogram when considering disc surgery.
What are the risks?
The risks associated with a discogram include infection inside the disc and an allergic reaction to the dye. Discograms require X-rays, which use radiation. In large doses, radiation can increase the risk of cancer. The vast majority of patients who have X-rays will never get enough radiation to worry about cancer. Only doctors whose patients who must get hundreds of X-rays over many years become concerned. This test has more risks associated with it than most. This is one reason that doctors prefer to use “noninvasive” tests first, such as MRI and CT scans.
If you or a loved one suffers from spinal pain, you owe it to yourself to call Southwest Scoliosis Institute at 214-556-0555 to make an appointment.