Cartilage is a firm but flexible tissue that caps the ends of bones inside a joint, letting them glide over each other with almost no friction. It has no blood supply of its own, so once damaged it heals slowly and often incompletely. In osteoarthritis the cartilage gradually thins, splits and wears away, which is why joints become stiff, ache after activity, and can grind (crepitus). Weight management, muscle-strengthening exercise and pacing are the mainstays of protecting whatever cartilage is left.
What is cartilage?
Cartilage: Cartilage is the smooth, tough connective tissue capping the ends of bones where they meet in joints. It cushions impact and allows friction-free movement. In osteoarthritis, cartilage gradually thins and roughens; it has no direct blood supply so heals slowly.
Last updated 2026-07-04. This is general information, not a substitute for personalised medical advice.