**Core Concept**
Barton's fracture is a type of intra-articular fracture that occurs at the base of the distal radius, involving a dislocation of the radiocarpal joint. This fracture is characterized by an intra-articular fracture of the distal radius with an associated dislocation of the radiocarpal joint, typically in the volar direction.

**Why the Correct Answer is Right**
Barton's fracture is caused by a fall on a pronated wrist, leading to a volar displacement of the distal fragment of the radius. The fracture involves the radiocarpal joint, resulting in a dislocation of the joint and articular surface disruption. The mechanism of injury is due to the force transmitted through the radius, causing a volar displacement of the distal fragment.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the characteristics of a Barton's fracture.
**Option B:** This option is incorrect as it refers to a different type of fracture, specifically a fracture involving the ulna.
**Option C:** This option is incorrect as it describes a different type of fracture, specifically a fracture involving the scaphoid bone.

**Clinical Pearl / High-Yield Fact**
Barton's fracture is an important consideration in the evaluation of wrist injuries, particularly in patients with a history of a fall on a pronated wrist. It is essential to obtain a detailed history and perform a thorough physical examination to diagnose this type of fracture.

**Correct Answer: D. Intra-articular fracture of the distal radius with volar dislocation of the radiocarpal joint.**