The fibula and tibia are very easy to distinguish, firstly, in terms of location, the fibula is located on the outer side of the calf and the tibia is located on the inner side of the calf. Secondly, according to the thickness of the tibia and fibula and the degree of weight bearing, the tibia is thicker because it is the main weight-bearing bone, while the fibula is a non-main weight-bearing bone, generally only about 1/6 of the body weight, so the relative circumference of the fibula is thin, in distinguishing the thick is the tibia, the thin is the fibula. In addition, the tibia will have a tibial plateau connected with the femur, while the fibula is not directly connected with the femur, the fibula is attached to the bone on the outside of the tibia, from this point can also make a distinction.