Baker's cyst causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Causes

A Baker's cyst is caused by swelling in the knee. The swelling is due to an increase in synovial fluid - the fluid that lubricates the knee joint. When pressure builds up, fluid bulges into the back of the knee.

Baker's cyst commonly occurs with:

• A tear in the meniscal cartilage of the knee
• Knee arthritis (in older adults)
• Rheumatoid arthritis
• Other knee problems