Baker's cyst is a sack full of fluid that appears behind the knee like a swelling that can be painful at times. It is called as a baker's cyst because it was discovered or locked up by a surgeon named William Baker. This baker's cyst is caused by excess fluid inside the knee joints and somehow located and opening behind the knee and somehow the sac behind the knee is filled with this fluid. The causes of your baker's cyst are osteoarthritis or rheumatoid arthritis or degenerative changes in the meniscus. Therefore, all these changes will cause an excess of fluid in the knee joint like a fluid-filled cyst behind the knee. It is also called a popliteal cyst.
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