Traumatic avascular necrosis occurs in which fracture -a) Neck femurb) Surgical neck humerusc) Talusd) Lunatee) Scaphoid
**Core Concept**
Avascular necrosis is a condition that occurs when there is a loss of blood to the bone, leading to bone death. In the context of traumatic injuries, certain fractures are more prone to disrupting the blood supply to the affected bone. The **femoral head**, **scaphoid**, and **talus** are particularly susceptible due to their unique blood supply.
**Why the Correct Answer is Right**
The correct answer is related to the anatomy of the bone and its blood supply. The **scaphoid bone** has a retrograde blood supply, making it vulnerable to avascular necrosis when fractured, especially in the proximal pole. The **femoral head** is also at risk due to its limited blood supply, which can be compromised in fractures of the **femoral neck**.
**Why Each Wrong Option is Incorrect**
**Option A:** While the femoral neck is a correct location for avascular necrosis to occur, the question asks for the specific fracture, and another option is more directly related to the common understanding of traumatic avascular necrosis.
**Option B:** The surgical neck of the humerus is not typically associated with avascular necrosis.
**Option C:** The talus can experience avascular necrosis, but it's less commonly highlighted in this context compared to another option.
**Option D:** The lunate can experience avascular necrosis, known as Kienbock's disease, but it's not typically described as traumatic.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that fractures of the **scaphoid bone**, especially those occurring in the proximal pole, have a high risk of avascular necrosis due to the bone's unique blood supply. This is a critical consideration in the management and treatment of scaphoid fractures.
**Correct Answer:** Correct Answer: e) Scaphoid