**Core Concept**
Talus fractures can lead to various complications due to its unique blood supply and anatomical location. The talus receives its blood supply primarily through its neck and posterior aspect, making it susceptible to avascular necrosis (AVN) after fractures.

**Why the Correct Answer is Right**
A non-displaced fracture of the talus can lead to osteoarthritis of the ankle joint due to the abnormal contact between the fragments and surrounding bones, causing joint degeneration. Avascular necrosis of the body of the talus is also a possible outcome, as the fracture disrupts the blood supply to the talus, leading to bone cell death and collapse. The body of the talus is more prone to AVN due to its limited blood supply.

**Why Each Wrong Option is Incorrect**
**Option B:** Osteonecrosis of the head of the talus is incorrect because the head of the talus is not typically affected by AVN after fractures, as it receives a more robust blood supply compared to the body and neck.

**Option C:** Avascular necrosis of the body of the talus is correct, but option C is incomplete as it does not include osteoarthritis of the ankle.

**Option D:** Avascular necrosis of the neck of the talus is incorrect because while the neck is a common site for AVN, the question specifies the body of the talus.

**Option E:** Non-union is not a direct consequence of a non-displaced fracture of the talus.

**Clinical Pearl / High-Yield Fact**
The talus is a unique bone that is susceptible to AVN due to its limited blood supply, making it essential to carefully evaluate and manage fractures of the talus to prevent long-term complications.

**✓ Correct Answer: A. ac. Osteoarthritis of ankle and Avascular necrosis of body of talus.**