## **Core Concept**
A Galeazzi fracture is a type of fracture that involves the radius bone in the forearm. It is characterized by a fracture of the radius accompanied by a dislocation of the distal radioulnar joint (DRUJ). This injury is named after the Italian orthopedic surgeon Riccardo Galeazzi.

## **Why the Correct Answer is Right**
The correct answer is a fracture of the radius with dislocation of the distal radioulnar joint (DRUJ). The Galeazzi fracture typically occurs when there is a fall onto an outstretched hand, causing a fracture of the radius. The fracture is often accompanied by a dislocation of the DRUJ, which can lead to instability of the wrist. The mechanism involves a disruption of the triangular fibrocartilage complex (TFCC) and the surrounding ligaments.

## **Why Each Wrong Option is Incorrect**
* **Option A:** A fracture of the ulna alone is not a Galeazzi fracture. While ulnar fractures can occur in conjunction with radius fractures, the defining feature of a Galeazzi fracture is the involvement of the DRUJ.
* **Option B:** A fracture of the distal radius without DRUJ dislocation is a common injury but does not meet the criteria for a Galeazzi fracture.
* **Option C:** This option might seem plausible but is not specific enough or accurate regarding the definition of a Galeazzi fracture.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that Galeazzi fractures require prompt and accurate reduction of both the fracture and the DRUJ dislocation to prevent long-term complications such as wrist instability and arthritis. These injuries are often treated surgically to ensure proper alignment and healing.

## **Correct Answer:** D. Radius with dislocation of distal radioulnar joint.