Zygomatic complex
Classification
Type 1 Undisplaced
Type 2 Arch fracture only
Type 3 Tripod fracture F-Z suture intact
Type 4 Tripod fracture F-Z suture distracted
Type 5 Blow out fracture only
Type 6 Orbital rim fracture
Type 7 Comminuted + other fractures
Clinical Features
1. Flattened cheek prominence
2. Swelling and bruising over cheek
3. Step deformity
4. Peri-orbital ecchymosis
5. Subconjunctival haemorrhage
6. Para/anaesthesia of infra-orbital nerve
7. Trismus and restricted lateral excursion
8. Para/anaesthesia of Z-Facial/Temporal nerves
9. Epistaxis
Radiographs
- Occipitometal 15 and 30 degrees
- Submentovertex
- CT scans
Radiographic features
1. Step at infra-orbital margin
2. Separation at F-Z suture
3. Fracture at arch
4. Fracture at buttress
5. Fluid level in antrum
6. Reduced distance between coronoid process and body of zygoma