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Spine MRIs Often Show Harmless 'Defects,' Study Finds
Date:3/13/2013

By Serena Gordon
HealthDay Reporter

WEDNESDAY, March 13 (HealthDay News) -- Even though expensive MRIs produce very detailed images for assessing back pain, they may not be very good at evaluating results after treatment, research suggests.

Many physicians order an MRI before and after treatment of patients with lumbar-disk herniation and persistent sciatica. But some experts say spine imaging is overused and not necessarily accurate in certain cases.

This new study used MRI scans from a study initially designed to compare surgery to conservative care for sciatica, which is pain or weakness that radiates from the back down the leg. The researchers compared a person's first MRI to their follow-up MRI taken a year later. They couldn't tell from the follow-up MRIs who had good results and who didn't.

"The discriminative power of MRI is much less than expected in patients who had sciatica before or who have had persistent complaints for more than one year," said the study's senior author, Dr. Wilco Peul, professor and chairman of neurosurgery at Leiden University Medical Center in the Netherlands.

Peul said that the decision to have a second surgery shouldn't be based on MRI findings alone.

Even if it appears from a follow-up MRI that surgery is necessary, he said people should be advised that their continued pain may be caused by inflammation rather than nerve compression, and in that case, it's unlikely that surgery would relieve their symptoms.

Results of the study are published in the March 14 issue of the New England Journal of Medicine.

Sciatica is a common problem, affecting as many as 40 percent of adults at some time in their lives. Sciatica is commonly caused by a herniated disc in the back as it presses down on the sciatic nerve, according to background information in the study. These discs are located between each of the vertebra, or bones, in the spine.

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