What is pes anserine bursitis (goose foot)?
Inflammation of the pes anserine (“goose’s foot”) bursa located at the medial aspect of the knee approximately 6 cm below the anteromedial joint line. The bursa lies between the conjoined tendons of the sartorius/gracilis/semitendinosus muscles and the medial collateral ligament. It is frequently described as knee pain, but it is typically noticed when lying on one’s side in bed when the knees are opposed. Pain is worsened by going up stairs. It is more common in obese individuals, patients with valgus knee deformity, and patients with pes planus. Pain is elicited by palpating the bursa and may have associated warmth.