A 32-year-old male presents to the emergency department 2 hours after a motorcycle accident with a compound fracture of the right tibia. There is a 3 cm skin laceration over the fracture site with visible bone ends, minimal contamination, and no vascular compromise. Which investigation is most appropriate to confirm the Gustilo classification grade and guide surgical planning?

Explanation

## Investigation of Choice for Open Fracture Assessment **Key Point:** Plain radiographs (AP and lateral views) are the investigation of choice for initial assessment and Gustilo classification of open fractures. They directly visualize bone displacement, comminution, and soft tissue involvement. ### Why Plain Radiographs Are Diagnostic Gustilo classification depends on: 1. **Fracture morphology** — comminution, displacement 2. **Soft tissue injury** — laceration size, contamination, bone exposure 3. **Mechanism** — high-energy vs. low-energy Plain films provide all morphologic information needed to assign grade (Type I, II, or IIIA/B/C) and determine urgency of debridement. ### Gustilo Classification Grading | Grade | Laceration Size | Contamination | Bone Comminution | Vascular Status | |-------|-----------------|----------------|------------------|------------------| | Type I | <1 cm | Minimal | Simple | Intact | | Type II | 1–10 cm | Moderate | Simple/comminuted | Intact | | Type IIIA | >10 cm | Severe | Comminuted | Intact, adequate soft tissue | | Type IIIB | >10 cm | Severe | Comminuted | Intact, inadequate soft tissue | | Type IIIC | Any size | Any | Any | **Vascular injury requiring repair** | **High-Yield:** Type IIIC is defined by **vascular injury**, not soft tissue loss. This is the critical distinction. ### Timing of Imaging **Clinical Pearl:** In the emergency setting, plain radiographs should be obtained **immediately** — they do not delay definitive management (emergency debridement within 6–8 hours). Do not delay surgical intervention waiting for advanced imaging. ### Role of Advanced Imaging - **CT angiography** — reserved for Type IIIC (suspected vascular injury) to map vessel anatomy pre-operatively - **MRI** — contraindicated acutely; too time-consuming and not needed for classification - **Doppler ultrasound** — operator-dependent; CT angiography is superior if vascular injury suspected **Mnemonic:** **PLAIN-FIRST** — Plain radiographs, Laceration size, Assess contamination, Identify comminution, Nerve/vessel check, First-line imaging for Gustilo grade.