**Core Concept**
The pulled elbow, also known as nursemaid's elbow, is a common injury in children where the radial head subluxates from the annular ligament, typically due to a sudden traction force on the extended arm with the elbow partially flexed.

**Why the Correct Answer is Right**
The pulled elbow occurs when the annular ligament, a fibrous ring that encircles the radial head, is partially torn, allowing the radial head to subluxate. This injury is usually seen in children between 1-4 years of age, with the majority of cases occurring in children under 2 years old. The mechanism of injury involves a sudden pull on the extended arm, often when a child is lifted by the hand or arm.

**Why Each Wrong Option is Incorrect**
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**Clinical Pearl / High-Yield Fact**
The pulled elbow is often characterized by a sudden onset of pain and a characteristic "nursemaid's elbow" deformity, where the child holds the affected arm in a flexed position at the elbow. A quick and effective reduction maneuver, such as the supination method, can often be performed to reduce the radial head and alleviate symptoms.

**Correct Answer:**
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