Magnetic Resonance Imaging (MRI) of the Knee

Knee MRI, MRI of the Knee

Risks

There are no known harmful effects from the strong magnetic field used for MRI. However, the magnet is very powerful. The magnet may affect pacemakers, artificial limbs, and other medical devices that contain iron. The magnet will stop a watch that is close to the magnet. Any loose metal object has the risk of causing damage if it gets pulled toward the strong magnet.

Metal parts in the eyes can damage the retina. If you may have metal fragments in the eye, an X-ray of the eyes may be done before the MRI. If metal is found, the MRI will not be done.

Iron pigments in tattoos or tattooed eyeliner can cause skin or eye irritation.

An MRI can cause a burn with some medicine patches. Be sure to tell your health professional if you are wearing a patch.

There is a slight chance of an allergic reaction if contrast material is used during the MRI. However, most reactions are mild and can be treated using medicine. There also is a slight risk of an infection at the IV site.

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Author:	Maria G. Essig, MS, ELS	Last Updated: June 1, 2007
Medical Review:	Paul D. Traughber, MD - Radiology Kenneth B. Sutherland, CD, BSc, MD, FRCPC - Diagnostic Radiology
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