Closed injuries to the extension mechanism of the digits.

Injuries to the extensor mechanism create an imbalance in the precise flexion-extension system that regulates finger motion. This imbalance results in visible and functional deformities. Although these deformities are initially supple, they can become fixed and progress to joint degeneration. This article outlines early diagnosis and accurate treatment of the most common extensor tendon injuries. Avoidance of late sequellae is the goal.