A 45-year-old construction worker from Delhi sustains a crush injury to his right wrist when a steel beam falls on his flexed wrist. On presentation, he has a 'bayonet' or 'garden spade' deformity with volar (anterior) angulation and displacement of the distal radius fragment. The radial styloid is prominent and lies anterior to the ulnar styloid. Plain radiographs confirm a distal radius fracture with volar displacement and loss of dorsal cortical continuity. What is the most appropriate initial management for this fracture?

Explanation

## Smith Fracture: Classification and Management ### Definition and Mechanism **Key Point:** Smith fracture is a volar (anterior) displacement of the distal radius fragment, caused by a fall on a flexed wrist (FOOSH with flexion) or direct blow to the dorsum of the wrist. ### Clinical Presentation The characteristic 'bayonet' or 'garden spade' deformity results from: - Volar angulation and displacement of the distal fragment - Radial styloid remains prominent and anterior - Loss of dorsal cortical continuity - Often associated with higher-energy trauma than Colles fracture ### Classification (Reverse Colles Variants) | Type | Characteristics | Mechanism | |------|-----------------|----------| | **Type I (Simple)** | Extraarticular volar displacement | Flexion injury | | **Type II (Comminuted)** | Comminuted with volar displacement | High-energy trauma | | **Type III (Intra-articular)** | Involvement of radiocarpal joint | Direct blow or crush | **Mnemonic:** **SMITH = Flexion injury → Volar displacement** (opposite of Colles) ### Initial Management Algorithm ```mermaid flowchart TD A[Smith Fracture Confirmed]:::outcome --> B{Fracture Type?}:::decision B -->|Type I: Simple, Extraarticular| C[Closed Reduction]:::action B -->|Type II/III: Comminuted or Intra-articular| D[ORIF with Volar Plate]:::action C --> E[Immobilize in Volar Slab/Cast]:::action E --> F[Wrist in Neutral or Slight Flexion]:::action D --> G[Volar Plate Fixation]:::action F --> H[Early Mobilization at 3-4 weeks]:::action G --> H ``` ### Why Closed Reduction is Preferred Initially 1. **Simple extraarticular fractures** (Type I) are amenable to closed reduction 2. Reduction performed under **regional or general anesthesia** 3. Immobilization in a **volar slab or cast** (NOT dorsal slab) 4. Wrist positioned in **neutral or slight flexion** (opposite of Colles, which is immobilized in extension) 5. Early mobilization at 3–4 weeks to prevent stiffness **Clinical Pearl:** Unlike Colles fractures (immobilized in extension), Smith fractures are immobilized in **flexion or neutral position** to maintain reduction and prevent loss of volar angulation. **High-Yield:** Smith fractures are often more unstable than Colles and may require ORIF if: - Comminution is present (Type II) - Intra-articular involvement (Type III) - Loss of reduction on follow-up radiographs - Associated with crush injuries (as in this case) ### Indications for ORIF - Comminuted fractures (Type II) - Intra-articular fractures (Type III) - Fractures with significant soft tissue injury - Unstable fractures with loss of reduction - Polytrauma requiring early mobilization **Tip:** In this case, the patient sustained a crush injury (high-energy mechanism), which suggests potential for comminution and instability. However, the question asks for **initial** management. Closed reduction is attempted first; ORIF is reserved for failures or confirmed comminution. [cite:Rockwood & Green's Fractures in Adults 9e Ch 18]