Okay, let's tackle this question. The user is asking about the least common complication of a closed supracondylar fracture in an 8-year-old child. First, I need to recall the common complications of this type of fracture. Supracondylar fractures are common in children, especially after falls on an outstretched hand.

The main complications I remember include compartment syndrome due to swelling, Volkmann's ischemic contracture from vascular compromise, malunion leading to cubitus varus, and nerve injuries like median or radial nerves. But the question is about the least common one.

Let me think: Volkmann's contracture is a serious but not the least common. Cubitus varus (elbow deformity) is a common long-term issue. Nerve injuries might occur but are less frequent than others. Wait, radial nerve injury is more common than median in this context? Or is it the opposite? Maybe the median nerve is more at risk because of its position near the fracture site.

Wait, the radial nerve runs along the posterior aspect, so maybe in supracondylar fractures, the median nerve is more commonly affected because the fracture is in the distal humerus, near where the median nerve is. So median nerve injury would be more common than radial. So if the question is asking for the least common, maybe radial nerve injury is less common.

Also, compartment syndrome is a feared complication but might not be the least common. So the options could be something like A. Volkmann's contracture, B. Cubitus varus, C. Radial nerve injury, D. Median nerve injury. Then the least common would be radial nerve injury.

But I need to check the typical answer for this. From what I remember, the most common complications are cubitus varus, then Volkmann's if not treated. Nerve injuries, especially median, are possible. Radial nerve injury is less common. So if the options include radial nerve injury, that's the least common. So the correct answer would be the one that's radial nerve injury. Therefore, the least common complication among the options given would be radial nerve injury.

**Core Concept**
Closed supracondylar humeral fractures in children are prone to neurovascular complications due to their proximity to the elbow. The *median nerve* is most vulnerable due to its anterior location relative to the distal humeral epiphysis. **Compartment syndrome** and **Volkmann’s ischemic contracture** are feared but less frequent than nerve injuries. **Cubitus varus** (gunstock deformity) is a common long-term complication from malunion.

**Why the Correct Answer is Right**
**Radial nerve injury** is the least common complication in this context. The radial nerve runs posteriorly along the humerus and is less likely to be directly affected by anterior displacement in supracondylar fractures. In contrast, the *median nerve* is more frequently injured due to its anterior position and proximity to the fracture site. **Volkmann’s ischemic contracture** arises from brachial artery compromise but occurs in <1% of cases. **Cubitus varus** affects ~30% of patients due to malunion at the distal humeral physis. **Why Each Wrong Option is Incorrect** **Option A:** *Median nerve injury* is more common than radial nerve

✓ Correct Answer: C. Nonunion