What is the primary mechanism behind jersey finger?

Jersey finger is primarily caused by the rupture of the flexor digitorum profundus tendon. This injury typically occurs when an athlete's finger is forcefully pulled while they are gripping or trying to hold onto an object, such as the jersey of an opponent in sports. As a result of this dynamic stress, the flexor tendon, which is responsible for bending the distal phalanx, can tear away from its attachment.

When the flexor digitorum profundus tendon ruptures, the affected finger is unable to flex at the distal interphalangeal joint, leading to a characteristic inability to flex the finger. This condition often requires surgical intervention to repair the tendon and restore function to the finger. Identifying this mechanism of injury is crucial for effective diagnosis and treatment in athletic training practice.