What causes PES Anserinus pain and tendinitis syndrome?
PES Anserinus pain or Pes Anserine bursitis usually happens when the Pes Anserinus tendon itself becomes inflamed due to use, or when a bursa becomes inflamed. Typically the bursa sits between the tendon and the bone and is basically a small sack of fluid.
The “bursa” is designed to reduce friction between soft tissues and the underlying bone and there are a number of these around the body, including in places such as the elbow.