Cartilage

What it means

Cartilage is a firm but flexible tissue with no nerves or blood vessels of its own. The kind that lines a joint — articular cartilage — caps the ends of the bones with a smooth, slippery surface so they glide over each other almost without friction, while also absorbing shock. Other cartilage forms the springy structures of the body, such as the menisci in the knee, the rim of the joint sockets, the ear, the nose, and the rings of the windpipe. In a joint, its job is to let bones move freely and painlessly.

Why it appears on a CT, MRI or X-ray report

Cartilage is normal anatomy, so it is named when the radiologist describes a change: thinning, softening, fraying, a flap, a defect, or general wear (often called chondral degeneration or, when widespread, osteoarthritis). Because cartilage is soft tissue, it is seen best on MRI, which can show its thickness and surface in detail. X-ray and CT cannot show cartilage directly but reveal it indirectly through narrowing of the gap between bones, which suggests the cushion has thinned.

What it usually means

Cartilage naturally thins and roughens with age, and this shows up on the scans of most older adults — often in joints that feel completely fine. So a report describing cartilage wear or thinning is one of the most common findings in musculoskeletal imaging and frequently an incidental, age-related change rather than a problem that needs treatment. What matters is whether it lines up with symptoms such as joint pain, stiffness, or swelling. Mild to moderate cartilage wear and osteoarthritis are usually managed without surgery, using exercise to strengthen the surrounding muscles, weight management, physical therapy, anti-inflammatories, and sometimes injections. Surgery, such as a joint replacement, is generally considered only for advanced wear that causes persistent pain and limits daily life. The picture is always read against how the joint actually feels and works.

When to follow up

The word cartilage on a report is anatomy; act on what is described and how the joint feels. See your doctor if you have joint pain, stiffness that is worse after rest or in the morning, swelling, or grinding that limits your activity. They will match the imaging against your exam to guide exercise, weight management, physical therapy, or, for advanced cases, a specialist opinion. Mild age-related cartilage wear without symptoms generally needs no action beyond staying active and strong.

A plain-language way to picture it

Imagine the smooth, glossy coating on the surface of an ice rink that lets a skate glide silently. Cartilage is that coating on the ends of your bones — slick enough that they slide rather than scrape. Over years of use the coating wears thin in patches, and where it thins the surface underneath becomes rougher, which is what we feel as a stiff or achy joint.