MRI scan of the knee

An MRI scan, short for Magnetic Resonance Imaging scan, is a diagnostic or imaging technique in which, using a large magnetic field, hundreds of images are made. This makes it possible to detect damage to muscles, tendons, capsules, ligaments and cartilage.

When is an MRI scan of the knee performed?

There are various reasons to have an MRI scan of the knee performed. The most common knee complaints for which an MRI scan is used are locking symptoms, swelling and limitations of movement of the knee.
Certainly in suspected tears of the meniscus, an MRI scan can visualise this well. In this specific case an X-ray is not sufficient.

How does the preparation for an MRI scan of the knee proceed?

On the day of the MRI scan, fasting is not required. You may therefore eat and drink as normal before the examination.

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

What is contrast medium in an MRI scan of the knee?

In some cases, contrast medium is used. This fluid is called gadolinium. When used, this agent is always administered during the preparation for the MRI scan, either via an IV or directly into the knee joint. Due to the contrast agent, 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 kind of tunnel. The head remains outside the tunnel. During the scan it is very important that the knee is not moved; this is why the knee is fixed.

The MRI scan takes on average 20 minutes. The scanner makes a loud, thumping noise. To reduce the disturbance, you are given headphones, possibly with music.

What happens after an MRI scan of the knee?

After the MRI scan the knee may make a 'squelching' sound if contrast medium has been administered. This disappears on its own after a day. In the first two days you should not stand for too long; after that the joint may gradually be loaded normally again.

Given the number of images the MRI scanner makes of the knee, the radiologist will need time to assess them. You will hear the result within a few days to a week via the specialist or the GP. It is advisable not to exercise until then; discuss this with the specialist.