How to determine whether the bone is injured after trauma, as follows: 1, whether there is local swelling, if the swelling is serious, the bone may be injured; 2, local pressure, if there is deep pressure pain, also consider the injury to the bone; 3, the fracture has specific performance, such as deformation. If the deformation of the whole bone is very obvious, the bone is also considered to be injured; 4. If the bone rubbing sensation or bone rubbing sound is obviously felt when local pressure is applied to the injured area, the bone is also considered to be injured; 5. When there is abnormal activity, i.e., the joint can move, and other places besides the joint can also move, the bone may be injured. After injuring the bone, the classification is different according to the age of the population. Children may have fractures caused by minor violence, and the fractures are followed by green branch fractures, bending and deformation. Adults have stronger bones and minor violence will not cause fractures, only great violence or injuries from car accidents or falls will cause fractures. Fractures in adults are prone to dislocation and have very severe symptoms. In the elderly, bones are more lax and minor trauma can cause fractures. Fractures in the elderly occur in three areas, the spine, the hip and the wrist.