Avascular necrosis seen in -a) # Surgical neck of humerusb) # Neck of scapulac) # Neck of talusd) # Neck of femure) # Neck of radius

**Core Concept**
Avascular necrosis refers to the death of bone tissue due to a lack of blood supply. This condition can occur in various bones, but it is more common in certain areas. The underlying principle being tested is the knowledge of which bones or parts of bones are more prone to avascular necrosis due to their blood supply.

**Why the Correct Answer is Right**
The correct answer is related to the anatomy and blood supply of the bones listed. Avascular necrosis is particularly common in the **femoral head**, which is the uppermost part of the **neck of femur**. This is because the blood supply to the femoral head is easily compromised, especially in the context of fractures or other traumatic injuries. The **neck of femur** is susceptible due to its limited blood supply, making it a common site for avascular necrosis.

**Why Each Wrong Option is Incorrect**
**Option A:** The surgical neck of the humerus does have a risk of fracture, but avascular necrosis is less common here compared to the femoral neck.
**Option B:** The neck of the scapula is not typically known for avascular necrosis.
**Option C:** The neck of the talus can experience avascular necrosis, but it is less common than in the femoral neck.
**Option E:** The neck of the radius is not typically associated with avascular necrosis.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that avascular necrosis often occurs in areas with a delicate or easily compromised blood supply, such as the **femoral head**. Recognizing the risk factors and common locations for avascular necrosis is crucial for early diagnosis and management.

**Correct Answer:** D. # Neck of femur