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FAQ Frequently asked questions
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.
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 …
About this article
Author: Jonathan Meddings BMedLabSc (Hons)
First answered: 13 Oct 2014
Last reviewed: 19 May 2018
Rating: 4.8 out of 5
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Category: Baker’s cyst