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What is a Baker's cyst?

A Baker's cyst, also called popliteal cyst, is an abnormal swelling at the back of the knee due to a build-up of synovial fluid within a bursa. A bursa is a fluid-filled sac that reduces friction at a joint.

FAQ Frequently asked questions

What causes Baker's cysts?

Baker's cyst is caused by joint fluid build-up in a bursa, or herniation of the synovial membrane through the back of the knee joint capsule. This can happen through: injury, infection, or arthritis (rheumatoid arthritis and osteoarthritis of the knee). for some …

How are Baker's cysts diagnosed?

Baker's cysts are diagnosed by: a physical examination and clinical history - your doctor will examine your knee and ask questions about your medical history; transillumination - the doctor will shine a light through the cyst to determine if it is …

How are Baker's cysts treated?

A Baker's cyst does not always require treatment. In particular, it is not usually recommended for children as the condition often goes away without treatment. Treatments can include: physiotherapy - icepacks, crutches and special exercises to maintain and …

Can a Baker's cyst burst?

Although rare, a Baker's cyst does have the potential to burst. When it does, it can result in sharp pain, swelling and redness of the leg. These symptoms resemble a blood clot in the leg, so it is important to seek medical attention.

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About this article

Author: Dr Bow Tauro PhD, BSc (Hons)
First answered: 10 Jul 2015
Last reviewed: 19 May 2018
Rating: 4.5 out of 5
Votes: 783 (Click smiley face below to rate)
Category: Anterior cruciate ligament (ACL) injury

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