The Pes anserine is a location on the knee just below and to the inside of the kneecap. 3 tendons connect into this area and when they become inflamed, it can cause Pes anserine bursitis: 1. Semitendinosis: hamstring muscle 2. Sartorius 3. Gracilis For rehab, I recommend modifying your activity first so the pain stays low level to no pain and adding in rehab exercises that address these 3 muscles as well as other areas that may be weaker such as a the glute med and glute max Comment below if you