The diagnosis of radial tuberosity subluxation in children is based on history, symptoms, signs and symptoms, as well as orthopedic based imaging, such as the simplest radiographs. The history of radial tuberosity subluxation in children is that the child’s arm is pulled, usually in hyperextension or full extension. Radial tuberosity subluxation is rare in the flexed position and usually occurs when the arm is pulled in the extended position. Most children cry when it happens, or older children, such as 4-5 year olds, may not cry, but will tell you that their arm hurts. This is the history, the process by which the injury occurred, and it is a very important basis for making a clinical judgment. In addition, when the process has occurred, the manifestations are: first, the arm movement is reduced. Can’t move the arm freely, can’t lift the arm up, the hand can’t grasp things, this is its manifestation. There are also auxiliary examinations, some orthopedic diseases need to give the patient photos, but the performance of the film is normal, can not be based on an X-ray to determine whether the child has radial tuberosity subluxation, subluxation of the film is normal because the child’s radial tuberosity is not fully developed, which we call cartilage, and cartilage in the X-ray is not visible, so the X-ray can not see the abnormalities.