Pes Anserine Bursitis is an inflammation of the bursa at the medial knee where the sartorius, gracilis, and semitendinosus muscles cross over and insert into the anteromedial proximal tibia. The function of the bursa is to cushion the structures around it. Stress to this area is typically caused by climbing and descending movements with additional weight. Pes anserine bursitis symptoms include pain, tenderness, and local swelling. http://www.sw.org/HealthLibrary?page=Pes%20Anserinus%20Syndrome%20with%20Rehab-SportsMed