## **Core Concept**
Gunstock deformity, also known as a "gunstock deformity" or "cubitus varus," refers to a complication that can arise after a supracondylar fracture of the humerus, particularly if the fracture is not adequately reduced or if there is a malunion. This deformity is characterized by a loss of the normal carrying angle of the elbow, leading to a varus angulation.

## **Why the Correct Answer is Right**
The correct answer, , is associated with a supracondylar fracture of the humerus. This type of fracture is common in children and occurs just above the elbow. If the fracture heals in a position of flexion and varus angulation, it can result in a gunstock deformity. This deformity gets its name from the resemblance to the deformity seen in the stock of a gun. The mechanism involves improper healing of the fracture, leading to a change in the carrying angle of the elbow.

## **Why Each Wrong Option is Incorrect**
* **Option A:** - This option is incorrect because although fractures can lead to various deformities, the specific association with gunstock deformity is not as directly linked as with supracondylar fractures.
* **Option B:** - This option is incorrect as there is no widely recognized association between this choice and gunstock deformity.
* **Option C:** - This option might seem plausible due to the involvement of the elbow, but it is not directly related to the development of a gunstock deformity.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that gunstock deformity is a potential complication of supracondylar fractures of the humerus, especially if not properly managed. Clinicians should be vigilant in the follow-up of these patients to prevent or address any malunion that could lead to this deformity.

## **Correct Answer:** . Supracondylar fracture of humerus