The lower leg bone is composed of the tibia and fibula, which are connected by the superior tibiofibular joint at the proximal end of the lower leg and the inferior tibiofibular joint at the distal end, with a tough interosseous membrane in between. The fibula is also a weight-bearing bone in the lower extremity, but it is not the primary weight-bearing bone, bearing approximately 20-30% of the weight. Generally speaking, the chance of fracture of the fibula alone is relatively small. Fractures of the fibula are often combined with fractures of the tibia or fractures or dislocations of the ankle joint. If a simple fibula fracture in the lower leg is more than 8 cm from the ankle, if the alignment of the fracture is acceptable, it is usually not operated and can be fixed in a cast or brace for about 6 weeks. If the fibula fracture is within 8cm of the ankle, or if the lower end of the fibula is part of the ankle joint and involves the outer ankle, resulting in unequal width of the gap of the ankle joint, we often say that the lower tibiofibular joint is separated, which is like a certain degree of mismatch of the gears, this requires surgical treatment and requires repositioning and fixation to solve the stability of the ankle joint. Otherwise, it may cause traumatic osteoarthritis, pain and limp, which may be lifelong.