Snapping pes anserinus syndrome

Last revised by David Luong on 12 Jul 2021

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

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

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 3. In some situations, it may also result from underlying lesions such as osteochondromas 2 or other tumors. 

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

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