On the outer edge of the wrist by the pinky finger, also known as the “Ulnar” side, there sits the extensor carpi ulnaris tendon. This ECU tendon runs all the way from the back of the forearm to the ulnar side of the wrist. The condition some people call “Snapping Wrist” actually results from the extensor carpi ulnaris tendon snapping in and out of the groove that it normally slides through in the wrist, due to some damage to the sheath that usually keeps it in place.

















