According to the Gustilo classification, which of the following best defines a Type III open fracture?

Explanation

## Gustilo Classification of Open Fractures The Gustilo classification system stratifies open fractures by severity, which guides treatment urgency, antibiotic choice, and prognosis. ### Type I - Skin break <1 cm - Clean wound, minimal contamination - Simple fracture pattern (usually non-comminuted) - Low energy mechanism ### Type II - Skin laceration >1 cm - Moderate contamination - Comminuted or simple fracture - Moderate energy mechanism ### Type III (Highest Risk) - **Extensive soft tissue damage** (muscle, skin, neurovascular structures) - May have bone loss - High contamination (farm/marine injuries, crush mechanisms) - Further subdivided into IIIA, IIIB, IIIC: - **IIIA:** Adequate soft tissue coverage despite extensive damage - **IIIB:** Periosteal stripping, bone exposure, requires flap coverage - **IIIC:** Arterial injury requiring repair **Key Point:** Type III fractures carry the highest risk of infection, non-union, and amputation. They require emergent debridement, vascular repair if needed, and often staged soft tissue reconstruction. **High-Yield:** Type IIIC is defined by **vascular injury**, not just soft tissue damage. This distinction is critical for exam questions. **Clinical Pearl:** Type III fractures mandate operative debridement within 3–6 hours, broad-spectrum antibiotics (including anaerobic coverage for farm injuries), and often require plastic surgery consultation for flap coverage. ### Comparison Table | Feature | Type I | Type II | Type III | | --- | --- | --- | --- | | Skin break | <1 cm | >1 cm | Extensive | | Soft tissue injury | Minimal | Moderate | Severe | | Contamination | Low | Moderate | High | | Fracture pattern | Simple | Simple/Comminuted | Comminuted ± bone loss | | Vascular injury | No | No | IIIC only | | Infection risk | ~2–5% | ~5–10% | ~10–50% | | Amputation risk | <1% | 1–2% | 5–50% | [cite:Rockwood & Green's Fractures in Adults, Ch 1]