**Core Concept**
The main risk in fracture Scaphoid is related to the vascular supply of the bone, specifically the proximal pole. The scaphoid bone receives its blood supply primarily from the radial artery through the vascular channels that enter the bone distally and proximally. However, the proximal pole has a precarious blood supply due to the limited number of vessels.

**Why the Correct Answer is Right**
The primary concern with scaphoid fractures is the risk of avascular necrosis (AVN) of the proximal pole. This occurs due to the compromised blood supply, which can lead to ischemic death of the bone tissue. The proximal pole is more susceptible to AVN because of its limited vascular supply. The risk of AVN is higher in fractures of the proximal pole, particularly those that are non-displaced.

**Why Each Wrong Option is Incorrect**
* **Option A:** While nerve injuries can occur with scaphoid fractures, they are not the main risk associated with this type of fracture.
* **Option B:** Malunion is a potential complication of scaphoid fractures, but it is not the primary risk.
* **Option C:** Infection is a possible complication of any fracture, but it is not the main risk specific to scaphoid fractures.

**Clinical Pearl / High-Yield Fact**
The "Terry Thomas sign" is a classic clinical finding associated with scaphoid fractures, which is a visible deformity on the dorsal aspect of the wrist due to the displacement of the scaphoid bone.

**Correct Answer: B. Malunion. Malunion is a potential complication of scaphoid fractures, which can lead to functional impairment and pain.**