## **Core Concept**
Transcervical fractures of the femur occur in the neck of the femur and are a type of hip fracture. These fractures can lead to various complications due to the anatomy and blood supply of the femoral head and neck. The blood supply to the femoral head is easily compromised in such fractures.

## **Why the Correct Answer is Right**
The correct answer, **Non-union or Avascular Necrosis**, is a well-known complication of femoral neck fractures, including transcervical fractures. The reason is that the blood supply to the femoral head, which runs along the surface of the femoral neck, can be easily disrupted in the event of a fracture. This disruption can lead to avascular necrosis (AVN) of the femoral head, where the bone tissue dies due to lack of blood supply. Non-union, or the failure of the fracture to heal, is another significant risk due to the same reasons.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While infection is a potential complication of any fracture, it is not the most common complication specifically associated with transcervical fractures of the femur compared to avascular necrosis or non-union.
- **Option B:** Malunion can occur but is less commonly emphasized as a major complication compared to avascular necrosis or non-union in the context of transcervical fractures.
- **Option D:** While nerve injury can occur with hip fractures, it is not the most common complication of transcervical fractures.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the risk of avascular necrosis increases with the degree of displacement and the angle of the fracture. Early diagnosis and treatment, including possible surgical intervention, are crucial to minimize complications.

## **Correct Answer:** . Avascular Necrosis