Pes anserinus snapping syndrome

Snapping pes anserinus syndrome is a condition that can occur with the pes anserinus tendons.

Clinical presentation

It is a frequent cause of medial knee snapping or painful clicking and catching experienced at the posteromedial corner of the knee when moving knee from flexion to extension.

Pathology

It usually results from impingement and translation of the gracilis tendon or semitendinosus tendon over the osseous structures of the knee during active flexion and extension.

It has been reported in athletes and in situations of trauma, overuse and as a result of anatomical variants and postoperative changes . In some situations, it may also result from underlying lesions such as osteochondromas or other tumors.

Radiographic features

Ultrasound

Ultrasound is often the diagnostic imaging test of choice in cases of mechanical snapping especially due to the use of dynamic interrogation.