Which among the following is TRUE regarding mallet finger?
## **Core Concept**
Mallet finger, also known as baseball finger, is a condition characterized by the rupture of the **extensor tendon** of the finger, specifically at the base of the distal phalanx. This injury often occurs when a ball strikes the fingertip, forcing it to flex while the extensor tendon is stretched or torn. It leads to an inability to extend the distal interphalangeal (DIP) joint.
## **Why the Correct Answer is Right**
The statement that is TRUE regarding mallet finger involves understanding its pathophysiology. Mallet finger results from a disruption of the **terminal extensor tendon** at its insertion on the base of the distal phalanx. This disruption can occur due to a direct blow to the fingertip or due to a sudden forced flexion of the fingertip while it is being actively extended. The condition is often associated with a characteristic physical examination finding where the patient is unable to actively extend the DIP joint.
## **Why Each Wrong Option is Incorrect**
- **Option A:** Without the specific details of option A, we can't directly address its inaccuracies. However, any statement contradicting the basic definition, cause, or clinical presentation of mallet finger would be incorrect.
- **Option B:** Similarly, without specifics, we assume any statement not aligning with established facts about mallet finger, such as its mechanism of injury or clinical features, would be wrong.
- **Option C:** This option's accuracy depends on its content. If it inaccurately describes the anatomy involved, the mechanism of injury, or the clinical presentation of mallet finger, it would be incorrect.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl for mallet finger is that it often does not require surgical intervention initially. Most cases are treated conservatively with a **mallet splint** that holds the DIP joint in extension for several weeks to allow the tendon to heal. This conservative management approach is crucial for preventing further injury and promoting proper healing.
## **Correct Answer:** D.