Motorcycle riders often find there is nothing better than cruising around town on a bright, sunny day. Unfortunately, not all journeys end successfully as motorcycle accidents can and do happen. They result in a variety of injuries including a fractured fibula. What is a Fractured Fibula? The fibula is the thin, large bone found in the lower leg on the outside of the calf. Because of its thinness, it is prone to fracturing when struck along the side. Such fractures can happen in the upper part of the fibula, on.