A 56-year-old female patient suffered a bimalleolar ankle fracture with an additional proximal fibular fracture. This is an unusual fracture type, seldom reported in literature. It was operatively treated by open reduction and internal fixation of the lateral malleolar fracture. The proximal fibular fracture was initially not found. Pathogenesis of the fracture seems most likely to be a pronation-eversion trauma, with an additional direct proximal fibular fracture. By reviewing this unusual case, it becomes clear that thorough examination of a trauma patient is very important. Secondary survey might be useful, since additional findings might appear. Treatment just using AO basic principles, will likely result in a satisfactory patient outcome.