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Pes anserine tendinobursitis syndrome is pain on the inside of the knee just below the joint. It happens when three tendons at the inside of the knee become inflamed. This is called tendonitis. The thin sac (bursa) between the shinbone and the three tendons also becomes inflamed. This is called bursitis.
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The reason why this problem develops is not clear. Some causes are:
This problem is more common in women. It is also more common in people who are 50 to 80 years of age.
Other things that may raise the risk of this problem are:
The main symptoms are pain and swelling on the inside of the knee just below the joint. The pain may be worse with activity, such as going up or down stairs. It may also be worse at night or first thing in the morning.
The doctor will ask about your symptoms and health history. You will be asked about the activities that you do. A physical exam will be done. It will focus on the knee. This is often enough to make the diagnosis.
The goal of treatment is to ease pain and swelling. Choices are:
The risk of this health problem may be lowered by slowly increasing the intensity and duration of activities.
Family Doctor—American Academy of Family Physicians
Ortho Info—American Academy of Orthopaedic Surgeons
Canadian Orthopaedic Association
Canadian Orthopaedic Foundation
Helfenstein M Jr, Kuromoto J. Anserine syndrome. Rev Bras Reumatol. 2010 Jun;50(3):313-327.
Pes anserine bursitis. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/pes-anserine-bursitis. Accessed February 1, 2021.
Pes anserine (knee tendon) bursitis. OrthoInfo—American Academy of Orthopaedic Surgeons website. Available at: http://orthoinfo.aaos.org/topic.cfm?topic=A00335. Updated March 2014. Accessed November 10, 2017.
Last reviewed December 2020 by EBSCO Medical Review Board Teresa Briedwell, PT, DPT, OCS, CSCS Last Updated: 2/1/2021