Do I need an X-ray or MRI for my knee pain?

Examination comes first

How the pain started, where it is and what the knee does (swell, lock, give way) narrow the diagnosis considerably. Specific examination tests check ligaments, the meniscus and the kneecap. Often, by the end of a consultation, the likely cause is clear and imaging is only needed to confirm it or plan treatment.

When an X-ray is useful

• After a fall or direct blow, if a fracture is possible
• To assess arthritis, ideally taken standing so the joint space is seen under load
• To check alignment of the leg and kneecap
• To look for loose fragments of bone

X-rays do not show ligaments, the meniscus or early cartilage damage, so a normal X-ray does not rule those out.

When an MRI is worth it

• A knee that swelled quickly after a twist, suggesting an ACL or meniscus tear
• Locking or catching that suggests a displaced meniscus tear or loose body
• Persistent pain after a sports injury that is not settling with treatment
• Planning surgery, where the detail guides the operation
• Unexplained pain, especially at night, where bone problems need to be excluded

Why scans can mislead

MRI is very sensitive. From middle age, it often shows meniscus wear, cartilage thinning or small tears in people who have no knee pain at all. Treating a scan rather than the patient can lead to unnecessary surgery. That is why a scan is most useful when ordered for a clear question and read by someone who has examined the knee.

At Aman Hospital in Doha, Dr. Gelber arranges X-rays and MRI on site when needed and goes through the images with you, so you understand what is relevant and what is not.