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What can cause pain in the back of the knee when straightening the leg?

What can cause pain in the back of the knee when straightening the leg?

When a person experiences pain in the back of their knee when straightening their leg, it is called posterior knee pain. Pain in the back of the knee, called the popliteal fossa, is common, but there is a wide range of causes, ranging from ligament injury to arthritis.

Source: Medical News Today

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