ABSTRACT
The origin of the flexor digitorum superficialis muscle has two heads – the humeroulnar and the radial. The flexor digitorum superficialis tendons attach to the anterior margins on the bases of the intermediate phalanges of the four fingers; however, it is relatively common for the flexor digitorum superficialis tendon to be missing from the fifth digit bilaterally and unilaterally. Trigger finger is caused by inflammation and thickening of the flexor digitorum superficialis tendons. The thickening of the flexor digitorum superficialis makes it difficult to glide through the A1 pulley. Risk factors to develop trigger finger include repetitive overuse of the finger, such as pulling the cord of a gas lawn mower and holding the safety bar while it is running or extensive typing and computer mouse using while the wrist and the elbow are flexed. Dorsal wrist ganglions are the most common type of ganglion cyst, usually originating from the dorsal portion of the scapholunate ligament.
