A 45-year-old male construction worker falls from a height of 2 meters onto his outstretched hand with the wrist in flexion. He presents with severe pain, swelling, and a deformity described as a 'spoon-like' or 'reverse dinner fork' appearance of the wrist. X-ray of the wrist shows a fracture of the distal radius with volar displacement and volar angulation of the distal fragment. The fracture line extends into the wrist joint. What is the most appropriate classification of this fracture?

Explanation

## Diagnosis: Smith Fracture (Intra-articular) ### Clinical Presentation and Mechanism The patient's presentation is consistent with a Smith fracture: - **Mechanism:** FOOSH with **wrist in flexion** (opposite of Colles) - **Clinical deformity:** 'Spoon-like' or **'reverse dinner fork'** appearance - **Volar displacement and volar angulation** of the distal radial fragment - **Intra-articular involvement:** Fracture line extends into the wrist joint ### Colles vs. Smith Fracture — Comparative Table | Parameter | Colles Fracture | Smith Fracture | |-----------|-----------------|----------------| | **Mechanism** | FOOSH + wrist extension | FOOSH + wrist flexion | | **Distal fragment direction** | Dorsal (posterior) | Volar (anterior) | | **Angulation** | Dorsal | Volar | | **Clinical deformity** | Dinner fork | Reverse dinner fork / Spoon | | **Frequency** | 90% of distal radius fractures | 5–10% of distal radius fractures | | **Age/bone quality** | Elderly, osteoporotic | Younger, high-energy trauma | | **Intra-articular involvement** | Often extra-articular | Often intra-articular | | **Prognosis** | Generally good with reduction | Higher risk of malunion and arthritis | **Key Point:** Smith fracture is sometimes called the "reverse Colles" because the distal fragment is displaced in the opposite direction (volar instead of dorsal). ### Classification of Smith Fractures Smith fractures are classified into three types based on the pattern: 1. **Type I (Extra-articular):** Transverse fracture of the distal radius, distal to the wrist joint 2. **Type II (Intra-articular, Barton-like):** Fracture-dislocation with volar displacement of the carpus and distal radial fragment 3. **Type III (Intra-articular):** Fracture involving the radiocarpal joint with volar angulation **High-Yield:** In this case, the fracture line extends into the wrist joint, making it an **intra-articular Smith fracture** (Type II or III). ### Why This Is NOT a Barton Fracture **Mnemonic: BARTON = Fracture-**D**islocation** - A true Barton fracture involves **dislocation of the carpus** along with the distal radial fragment - While some Smith fractures can be intra-articular and resemble Barton fractures, the key distinction is that Barton fractures are **fracture-dislocations** with carpal displacement - This patient's presentation is consistent with an intra-articular Smith fracture without explicit mention of carpal dislocation **Clinical Pearl:** Smith fractures have a higher incidence of complications (malunion, post-traumatic arthritis, loss of grip strength) compared to Colles fractures, especially when intra-articular, due to the difficulty in maintaining reduction and the involvement of the articular surface. ### Management Implications - **Closed reduction** with wrist in extension (opposite of the mechanism) - **Percutaneous pinning or open reduction internal fixation (ORIF)** often required for intra-articular fractures - **Close follow-up** to monitor for malunion and loss of reduction - **Early mobilization** after fracture healing to prevent stiffness