A 28-year-old male labourer presents to the emergency department after a fall from a 10-foot scaffold onto his outstretched right arm. On examination, the right forearm shows gross deformity with the wrist in a 'dinner fork' appearance. Plain radiographs reveal a fracture of the distal radius with dorsal displacement and angulation of the distal fragment, with the fracture line extending into the radiocarpal joint. The ulna is intact. Which classification best describes this fracture pattern?

Explanation

## Fracture Identification The clinical presentation describes a **Barton's fracture (dorsal variant)** — an intra-articular fracture-dislocation of the distal radius with dorsal displacement. ### Key Radiographic Features of Barton's Fracture **Key Point:** Barton's fracture is characterized by: 1. Fracture of the distal radius with the fracture line **extending into the radiocarpal joint** (intra-articular) — the defining criterion 2. **Dorsal displacement and angulation** of the distal radial fragment (dorsal Barton's) 3. The carpus displaces **with** the fractured fragment — a true fracture-dislocation 4. Ulna is typically intact 5. High-energy mechanism (falls from height, motor vehicle accidents) ### Why This Is NOT a Colles' Fracture A classic Colles' fracture is **extra-articular** — the fracture line lies 2–3 cm proximal to the wrist joint and does **not** extend into the radiocarpal joint. The stem explicitly states "the fracture line extending into the radiocarpal joint," which is the defining criterion that excludes Colles' and identifies Barton's fracture. The "dinner fork" deformity can be seen in both Colles' and dorsal Barton's fractures due to dorsal displacement, but the intra-articular extension is the key differentiator. ### Comparison with Other Distal Radius Fractures | Fracture Type | Articular Involvement | Displacement | Key Feature | | --- | --- | --- | --- | | **Colles'** | Extra-articular | Dorsal | Dinner fork deformity; 2–3 cm proximal to joint | | **Smith's** | Extra-articular | Volar | Reverse dinner fork; volar angulation | | **Barton's (dorsal)** | Intra-articular | Dorsal | Fracture-dislocation; carpus displaces with fragment | | **Barton's (volar)** | Intra-articular | Volar | More common variant; unstable | | **Chauffeur's** | Intra-articular | Variable | Radial styloid fracture; avulsion mechanism | **High-Yield:** The critical distinguishing feature of Barton's fracture is **intra-articular extension with carpal displacement** — the carpus moves with the fractured fragment, creating a fracture-dislocation pattern. This is a classic NEET PG differentiator from Colles' fracture. **Clinical Pearl:** Barton's fracture is inherently unstable due to its intra-articular nature and typically requires **open reduction and internal fixation (ORIF)** with a buttress plate, unlike Colles' fracture which can often be managed with closed reduction and casting. (Reference: Rockwood and Green's Fractures in Adults; Campbell's Operative Orthopaedics) ### Complications to Monitor - Post-traumatic radiocarpal arthritis (due to intra-articular involvement) - Carpal instability - Median nerve injury - Malunion with persistent carpal subluxation