Which of the following correctly distinguishes a Galeazzi fracture from a Monteggia fracture?

## Monteggia vs. Galeazzi: Comparative Analysis **Key Point:** These are two distinct injury patterns of the forearm. The key differentiator is WHICH bone is fractured and WHICH joint is disrupted. ### Side-by-Side Comparison | Feature | Monteggia | Galeazzi | | --- | --- | --- | | **Primary fracture** | Ulna (proximal/middle third) | Radius (distal third) | | **Associated dislocation** | Radial head (anterior) | Distal radioulnar joint (DRUJ) | | **Direction of dislocation** | Anterior | Dorsal (posterior) | | **Mechanism** | Hyperpronation, hyperextension, direct blow | Fall on extended wrist, axial load | | **Age group** | Both children and adults (common in children) | Both children and adults | | **Eponym origin** | Giovanni Battista Monteggia (1814) | Guglielmo Galeazzi (1934) | **High-Yield:** The mnemonic to remember the difference: - **Monteggia**: **M**onteggia = **U**lna fracture + **R**adial head dislocation - **Galeazzi**: **G**aleazzi = **R**adius fracture + **D**RUJ disruption ### Anatomical Mechanism ```mermaid flowchart TD A[Forearm Injury]:::outcome --> B{Which bone fractured?}:::decision B -->|Ulna| C[Monteggia Fracture]:::outcome C --> D[Radial head dislocates ANTERIORLY]:::action B -->|Radius| E[Galeazzi Fracture]:::outcome E --> F[DRUJ disrupts - dorsal displacement]:::action D --> G[Check lateral radiograph for radial head position]:::action F --> H[Check wrist for DRUJ widening on AP view]:::action ``` **Clinical Pearl:** Both injuries are frequently missed on initial radiographs. The key is to: 1. Identify the primary fracture (ulna vs. radius) 2. Look for the ASSOCIATED injury (radial head dislocation vs. DRUJ disruption) 3. Obtain both AP and lateral views to visualize the dislocation/disruption **Mnemonic:** **"U for Ulna, R for Radius"** — Monteggia has Ulna fracture; Galeazzi has Radius fracture.