CausesBy Mayo Clinic Staff
A lubricating fluid called synovial (sih-NO-vee-ul) fluid helps your leg swing smoothly and reduces friction between the moving parts of your knee.
But sometimes the knee produces too much synovial fluid, resulting in buildup of fluid in an area on the back of your knee (popliteal bursa), causing a Baker's cyst. This can happen because of:
June 12, 2015
- Inflammation of the knee joint, such as occurs with various types of arthritis
- A knee injury, such as a cartilage tear
- Helfgott SM. Popliteal (Baker's) cyst. http://www.uptodate.com/home. Accessed April 27, 2015.
- Imboden JB, et al. Approach to the patient with knee pain. In: Current Rheumatology Diagnosis & Treatment. 3rd ed. New York, N.Y.: The McGraw-Hill Companies; 2013. http://www.accessmedicine.com. Accessed April 27, 2015.
- Arthritis of the knee. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=a00212. Accessed April 27, 2015.