MRI scan — knee

Category: Imaging & Scans · All imaging & scans

What it is

An MRI scan of the knee uses a magnet and radio waves to produce detailed pictures of the cartilage, ligaments, tendons and bones inside the knee joint.

Why it is done

It is often used after a knee injury, for ongoing knee pain, swelling or locking, or when a torn ligament or cartilage problem is suspected and the result would change treatment.

How to prepare

There is usually no special preparation beyond the standard MRI metal-safety checks. You can usually eat and drink normally.

What happens during the procedure

You lie on the table with your leg in a padded frame (coil) and only your leg goes into the scanner opening for most knee scans. It is noisy and takes about 20 to 30 minutes; keeping the leg still is important.

Afterwards — recovery & results

You can return to normal activities immediately. A radiologist reports the scan and your doctor will discuss the findings and next steps with you.

Risks & considerations

MRI has no ionising radiation. The magnet makes it unsuitable for some implants, which is why screening questions are asked. Lying still with an uncomfortable knee can be the hardest part for some people.

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Frequently asked questions

Will the scan decide if I need an operation?

It is one piece of the picture. Surgeons decide using your symptoms, the examination and the scan together — some tears found on MRI are managed without surgery.

Can I move during the scan?

Small movements blur the pictures, so the team will make you comfortable with cushions first. If you become uncomfortable, you can speak to them through the intercom.

Related procedures — Imaging & Scans

Abdominal ultrasound Angiography (catheter angiogram)Barium swallow and meal Breast ultrasound Carotid Doppler ultrasound Chest X-ray

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Please note: This page is educational information about a medical procedure or test. It does not replace the instructions of your own care team, who know your situation and whose preparation, fasting and medication advice you should follow if it differs from anything here. If you have symptoms that worry you, or an appointment you do not understand, contact your clinical team.