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There are three general types of joint where two or more bones come together, each type is characterised by different degrees of movement and function:
Of these the most common and more important pathologically is the synovial joint. The synovial joint is characterised by the largest degree of movement.
Synovial joints are characterised by cartilage coated articular surfaces, surrounded by a fibrous capsule lined by an epithelial layer of synovium. This synovium secretes synovial fluid, into the joint space, which acts to lubricate the joint.