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What is bone-on-bone in the knee?

Question:

What is bone-on-bone in the knee?

Cartilage:

Cartilage is a smooth, slippery type of connective tissue that is found in several places in your body. Cartilage covers the ends of your long bones, like the femur in your leg and the humerus in your upper arm. It is there to keep your joints moving smoothly and lets joints move with very little friction as you walk, jump, and run.

Answer and Explanation:

Bone-on-bone occurs in the knee joint when cartilage wears down exposing the ends of the bone. This allows them to grind against each other, creating...

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