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A joint is where one bone moves on another. The two bones are held together by ligaments. Ligaments are like elastic bands: they keep the bones in place while muscles lengthen and shorten to make the joint move.
A coating of cartilage covering the bone surface stops the bones from rubbing directly against each other. This helps the joint to work smoothly.
The joint is surrounded by a capsule and the space within the joint (joint cavity) contains synovial fluid.
This fluid, which provides nutrients to the joint and cartilage, is produced by the synovial membrane (or synovium) which lines the joint cavity.
What goes wrong with joints varies from one kind of arthritis to another.
