Baker’s cyst

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Baker's cyst

Baker's cyst is an accumulation of joint fluid (synovial fluid) that forms behind the knee.

Popliteal cyst

Baker's cyst is a fluid collection behind the knee. This cyst may be formed by the connection of a normal bursa (a normal lubricating fluid sac) with the knee joint. This type is more common in children.

The condition can also be caused by the herniation of the knee joint capsule out into the back of the knee, which is more common in adults. This type of Baker's cyst is commonly associated with a tear in the meniscal cartilage of the knee. In older adults, this condition is frequently associated with degenerative arthritis of the knee.

A large cyst may cause some discomfort or stiffness but generally has no symptoms. Baker's cysts usually disappear spontaneously, but the time in which they do so is variable.

Review Date: 09/26/2006
Reviewed By: Andrew L. Chen, M.D., M.S., Orthopedist, The Alpine Clinic, Littleton, NH. Review provided by VeriMed Healthcare Network.