Extension Tendon Rupture

Extensor tendons are located on the back of the hand and fingers and are responsible for straightening the fingers. Due to their location they are vulnerable to injury where a minor cut or a jamming injury may occur, such as within a door frame, causing the tendon to rupture (tear) from the bone. There are a number of deformities that can occur following an extension tendon rupture, including mallet finger, boutonniere deformity, and lacerations or cuts of the tendon.