Generally speaking, whether a fracture occurs after trauma can be analyzed in terms of both post-injury symptoms and functional impairment. If the injured area is in severe pain, with significant local swelling, severe subcutaneous ecchymosis, bruising, and deformity in appearance, there is a higher possibility of fracture. In terms of functional impairment, when the arm is injured, such as poor grip strength of the hand, or even unable to lift something; lower limb injury, then unable to stand or walk; lumbar fracture can only lie flat and can not sit. All should be considered to have fracture. A simple percussion method can also help to determine this. If the upper limb is fractured, tap the injured palm with the other hand, and if the injury is painful, the fracture may be large; if the lower limb is injured, tap the heel with your fist, and the injury is painful, the fracture is most likely. It should be noted that the elderly, because of osteoporosis, sometimes in the case of a small external force is also easy to fracture, coupled with the elderly nerves are not very sensitive, which makes the elderly fracture pain will not be too obvious or symptoms will be obvious lag. Therefore, the elderly should pay attention to any fall or external impact, and should go to the hospital for examination if necessary.