MRI scan of the knee

An MRI scan, short for magnetic resonance imaging, is a diagnostic imaging technique that uses a strong magnetic field to produce hundreds of images. This makes it well suited to identifying damage to muscles, tendons, joint capsules, ligaments, and cartilage.

When is an MRI scan of the knee performed?

There are several reasons to have an MRI scan of the knee. The most common knee problems for which an MRI scan is used are mechanical locking, swelling, and limitations in knee motion.
Especially when a tear in the meniscus is suspected, an MRI scan can visualize this well. In this specific case, an X-ray is not sufficient.

How do you prepare for an MRI scan of the knee?

Fasting is not required on the day of the MRI scan. You may eat and drink as usual before the examination.

It is important not to wear metal objects (glasses, jewelry, bra, etc.) when entering the scanner. These can disturb the magnetic field and cause the imaging to fail.

What is contrast agent for an MRI scan of the knee?

In some cases, a contrast agent is used. This agent is called gadolinium. When used, it is always administered during preparation for the MRI scan, either through an IV or directly into the knee joint. Due to the contrast, abnormalities of the knee are easier to see.

How does an MRI scan of the knee work?

During the MRI scan, the patient lies with the knee in the middle of a sort of tunnel. The head remains outside the tunnel. It is very important not to move the knee during the scan; this is why the knee is immobilized.

The MRI scan takes about 20 minutes on average. The scanner makes a loud, thumping noise. To reduce this, you will be given headphones, optionally with music.

What happens after an MRI scan of the knee?

After the MRI scan, the knee may make a 'squelching' sound if contrast was administered. This disappears on its own after a day. For the first two days you should avoid standing for long periods; after that, you may gradually resume normal loading of the joint.

Given the number of images the MRI scanner produces of the knee, the radiologist will need time to assess them. You will hear the results from the specialist or the family doctor within a few days to a week. It is advisable not to play sports until then; discuss this with the specialist.