Typically, a Maisonneuve fracture involves a fracture of the medial malleolus of the ankle with disruption of the tibiofibular syndesmosis. This results in a fracture of the proximal third of the fibula. The Maisonneuve fracture results from an ankle eversion injury.
Lateral radiograph of the ankle. This shows a fracture of the posterior lip of the tibia. 
AP radiograph of the upper tibia and fibula. This shows a fracture of the proximal fibula. This is a Maisonneuve fracture.