Radial tuberosity subluxation is one of the common elbow injuries in infants and children. The age of onset is mostly between 1-4 years, with the highest incidence between 2-3 years. A common cause is pulling on the child’s arm (inadvertently, without violence), in addition to pressure from a fall (or sleep, etc.). The onset is without a history of severe trauma or infection. The child cries, refuses to move the elbow in semi-flexion, the affected limb does not droop naturally, the shoulder can move but refuses to lift and move, and when asked to raise the hand, it can barely lift but cannot (or can only) touch the forehead and never the back of the head. If an x-ray is performed, nothing abnormal is found. Treatment is relatively simple, as long as the disease is aware of the pediatric surgeon can be reset, reset without anesthesia, basically painless. After reset, the elbow and forearm can move freely. Prevention: 1, usually try not to pull the child’s hand alone, tug the child (or when dressing), together with the sleeve of the coat to pull. 2.Prevent falls. 3.Avoid habitual radial head subluxation.