The Weber classification is used to determine the severity of tibiofibular ligament injury by the level of fibular fracture. The Weber C fracture consists of a proximal fracture of the fibula and a transverse fracture of the medial malleolus (or an intact malleolus and a ruptured deltoid ligament). This results in complete disruption of the tibiofibular ligament complex and is from pronation-lateral rotation injury.

A	Lateral radiograph of the ankle. This shows a fracture of the distal fibula.
B	Mortise and AP radiographs of the ankle. These show a fracture of the fibula superior to the tibiotalar joint, a Weber C fracture.

Links to online textbooks:

• Wheeless' Orthopedics: discussion of Weber C fractures

Links to online cases:

• The Physician and Sports Medicine
• Emedicine.com

References:

• Arimoto HK, Forrester DM: Classification of ankle fractures: an algorithm AJR Am J Roentgenol. 1980 Nov;135(5):1057-63.           [See related articles]
• Harper MC: Ankle fracture classification systems: a case for integration of the Lauge-Hansen and AO-Danis-Weber schemes Foot Ankle. 1992 Sep;13(7):404-7.           [See related articles]