The long bones of the extremities are mainly the bones of the upper arm, forearm, thigh and lower leg, mainly the humerus, femur, tibia, fibula, ulna and radius, which are usually referred to as the long bones. Generally speaking, the long bones have the possibility of fracture, and after the fracture, most of them can be treated conservatively by taking manual repositioning. If the displacement is obvious, internal fixation can be chosen, which is mainly done by intramedullary pins. If the fracture is clearly crushed, plate treatment is available. It usually takes about one year for a long bone fracture to heal, and about two years for a femur because of the amount of weight it bears. Fractures of the long bones usually do not have sequelae because they do not involve the joints.