Fig.1 Lateral knee dislocation shown on plain radiograph of a 43-year-old man who fell from height. A bony fragment is noted (red arrow) in the lateral tibiofemoral compartment.
- Acute knee dislocation (less than 3 weeks), chronic (equal or more than 3 weeks)
- Anterior > posterior > medial, lateral, rotational dislocation
- Current classification scheme uses associated ligamentous injury as a determinant
- Common associated injuries = peroneal nerve injury (20%), popliteal artery injury (19%), fracture of distal femur or proximal tibia (16%)
- When to image popliteal artery? history of ischemia, signs of impaired circulation such as color change, diminished/absent pulses, <>
- Operative management immediate if vascular injury is confirmed. Patterns of ligamentous injury dictate later-stage management.