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How does a normal joint work?

A joint is where two or more bones meet. The joint allows your bones to move freely but within controlled limits.

The ends of your bones are coated with a layer of tough, slippery tissue called cartilage. Cartilage acts a bit like a shock absorber to spread the load more evenly across your joint.

Your knees have extra rings of cartilage between the bones. These are called menisci.

A normal joint

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