Is knee cracking a sign of arthritis?

Noise versus arthritis

Knee noises are common at every age, including in teenagers and fit athletes whose cartilage is perfectly healthy. Arthritis is a gradual loss of the smooth cartilage lining the joint. As it advances, the surfaces become rough and the grinding often becomes coarser and more constant. But it almost never arrives as noise alone.

Studies have linked grinding with a somewhat higher chance of arthritis behind the kneecap in some groups, but cracking without symptoms is not a diagnosis, and many people with noisy knees never develop arthritis.

Myths worth clearing up

• Myth: cracking your knees wears them out. Painless gas release does not damage cartilage
• Myth: noisy knees mean you should stop exercise. Inactivity weakens the muscles that protect the joint
• Myth: young people's knees should be silent. Noise is common at every age
• Myth: a supplement or oil will stop the noise. There is no good evidence for this
• Myth: if it cracks, it needs a scan. Painless noise with a normal examination usually needs no imaging

Signs that do suggest arthritis

• Aching with walking or stairs that builds over months
• Morning stiffness that eases with movement, often under half an hour
• Swelling after activity
• Difficulty kneeling, squatting or sitting on the floor
• Usually from middle age, or earlier after a past injury or meniscus surgery

What to do and when to book

If your knees crack but feel fine, stay active and keep your thigh and hip muscles strong. Maintaining a healthy weight reduces load on the joints. If you have the aching and stiffness described above, book an assessment. At Aman Hospital in Doha, Dr. Gelber examines the knee and uses standing X-rays to judge whether arthritis is present and how advanced it is, which guides treatment from exercise and weight management to injections or surgery in selected cases.