Mallet finger is an injury to the thin tendon that straightens the end joint of a finger or thumb.
Causes and risk factors
Although it is also known as “baseball finger,” this injury can happen to anyone when an unyielding object (like a ball) strikes the tip of a finger or thumb and forces it to bend further than it is intended to go. As a result, you are not able to straighten the tip of your finger or thumb on your own.
The finger is usually painful, swollen, and bruised. The fingertip will droop noticeably and will straighten only if you push it up with your other hand.
Diagnosis and treatment
A mallet finger injury requires medical treatment to ensure the finger regains as much function as possible. Most doctors recommend seeking treatment within a week of injury. However, there have been cases in which treatment was delayed for as long as a month after injury and full healing was still achieved.