Fig. 9
From: Distal forearm squeeze test for the diagnosis of digital flexor tendon injuries
The mechanism of the distal forearm squeeze test. a The normal hand. b The digital flexor and extensor tendons are in a tug-of-war during the distal forearm squeeze test. In normal conditions, the digital flexor tendons win by overwhelming advantage. c If the digital flexor tendons are ruptured, the extensor tendons win. The thick arrow represents the force of digital flexor tendons, while the thin arrow represents the force of digital extensor tendons