Joint Ventures' Blog

What is Pes Anserinus Bursitis?

The pes anserinus is made up of three tendons which include the sartorius, gracilis, and semitendinosus muscles. These muscles are primary flexors of the knee and help protect the knee from extreme valgus or lateral stress.  Combined anatomically they lie just above the medial collateral ligament.  Pes Anserinus bursitis is irritation of the bursa or fluid filled sac that helps to cushion the knee between these anatomical structures. Pes Anserinus bursitis can occur from: