In clinical practice, when a patient has a fracture or sprain of the arm, self-perception, physical examination, and ancillary examinations can make a clear determination. If an elbow fracture occurs, the patient will feel a pain like pins and needles, swelling and deformity in appearance, positive local pressure pain, abnormal movement or bone rubbing sounds, and functional impairment of the elbow joint. X-rays can be taken to clearly see the presence of a fracture line and also to see the displacement of the fracture. If the elbow sprain is a muscle or soft tissue injury, the patient feels distension or stagnation pain in the elbow area, and there is positive local pressure pain on palpation, but there is no bone rubbing sound, and the patient can move the elbow joint appropriately, and the diagnosis can be made clearly by ultrasonography.