The three elements to determine the fracture are as follows: First, whether there is bone rubbing sound and bone rubbing sensation at the injury site. If the injury site can feel obvious bone rubbing sensation by touching it with hands, or even hear the rubbing sound due to the fracture break end, it can be judged that a fracture has definitely been produced. Second, whether the injury local has abnormal activity, normal limb due to the existence of bone continuity, there will be no abnormal activity, but when the fracture is produced, in the place where the joint movement can not be produced will lead to the production of joint movement, through this point can also determine the existence of fracture. Third, local deformity, if the local produces obvious deformity, it can also be judged that a fracture is produced.