What results from a blow to the tip of the finger causing an avulsion of the extensor tendon?

Mallet finger occurs as a result of a blow to the tip of the finger that leads to an avulsion of the extensor tendon. This injury characteristic is marked by the inability to extend the distal phalanx (the last bone of the finger), causing it to droop or hang down. The mechanism typically involves a direct impact that damages the tendon or the bony attachment, resulting in a disruption of the normal function of the extensor tendon.

In this condition, the distal phalanx cannot be straightened voluntarily, leading to a classic appearance where the tip of the finger droops. Treatment often focuses on proper immobilization in a specific position to allow for healing and restoration of function. Mallet finger highlights the critical role of the extensor tendon's integrity in maintaining proper finger mechanics.