Magnetic Resonance Imaging (MRI) of the Knee
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 doctor if you are wearing a
There is a slight chance of an
allergic reaction if contrast material is used during
the MRI. But most reactions are mild and can be treated using medicine.
Contrast material that contains gadolinium may cause a serious problem (called
nephrogenic systemic fibrosis) in people with
kidney failure. If you have decreased kidney function
or serious kidney disease, tell your doctor before having an MRI scan.
There also is a slight risk of an infection at the IV site if contrast
material was used.
Magnetic resonance imaging (MRI) is a test done with a large machine that uses a magnetic
field and pulses of radio wave energy to make pictures of the knee .
radiologist may discuss preliminary results of the MRI
with you right after the test. Complete results are usually available for your
doctor in 1 to 2 days.
Magnetic resonance imaging (MRI) of the knee
| Normal: |
tendons, bones, and joints look normal in size, shape,
No growths, such as tumors, are
No broken bones (fractures),
extra fluid, or loose bodies are present.
No signs of inflammation or infection in
bones, joints, or soft tissues are present.
Bones show an injury or a fracture. The MRI
also may show a collection of fluid, which could mean an infection is
Ligament or meniscus tears are
Tendon tears are present. The MRI may also show a thickening, meaning surgery or a tear you had in the past or repeated stress.
Growths, such as tumors, are
Changes common to
arthritis are present.
What Affects the Test
Reasons you may not be able to
have the test or why the results may not be helpful include:
- Metal devices in your leg from previous
surgery. These may make the MRI pictures blurry and prevent your doctor from
seeing what is wrong with your knee.
- Pregnancy. An MRI test usually is not done during
- Medical devices that use electronics, such as a
pacemaker or medicine infusion pump. The MRI magnet may cause problems with
- If you are not able to remain still during the
- Obesity. A person who is very
overweight may not fit into the opening of some standard MRI machines.