It was first described by Fournier in 1671. Radial tuberosity subluxation, also known as Dara’s elbow, is one of the common elbow injuries in infants and children. The age of onset is 1 to 4 years, with the highest incidence at 2 to 3 years of age, accounting for 62.5%. The disease is more common in boys than girls, and more on the left than on the right. When the elbow joint is straight, the forearm rotates forward and is suddenly pulled longitudinally, which can easily cause radial head subluxation, and sometimes the upper arm is pressed under the torso when the child turns over, resulting in injury and dislocation. It is common for adults to lead children up steps and pull their arms. Etiology: The articular surface of the radial head and the longitudinal axis of the radius have a certain inclination, the size of which is related to the rotational activities of the forearm. The variability of the tilt affects the up-and-down activity of the annular ligament, and the variability of this tilt undoubtedly makes it easy to dislocate in the forward and backward rotation position of the forearm. When the wrist or forearm is suddenly pulled longitudinally by the rotational action of the elbow joint in the straight position, the lower part of the annular ligament will produce a transverse tear and move slightly downward, the humeral radial joint gap will become large, and the joint capsule and the upper part of the annular ligament can be embedded in the radial joint gap by simply sliding over a part of the joint surface of the distal end of the radial tuberosity tilt due to the negative pressure of the joint cavity, thus preventing the radial tuberosity from being reset and causing radial tuberosity subluxation. Clinical manifestations: pain in the elbow during subluxation, the child cries, the elbow is semi-flexed, the forearm is moderately rotated forward, does not dare to rotate backward and flex the elbow, refuses to lift and move the affected limb, pressure pain in the radial head area, negative X-ray examination, normal humeral radial relationship. Examination: X-ray examination of this disease is negative, and the diagnosis can generally be confirmed based on clinical manifestations and medical history, without the need for auxiliary examination. Diagnosis: 1. This disease is mostly caused by indirect violence. Such as using both hands to pull the toddler’s wrist fall in walking; dressing by the cuffs pulling the toddler’s wrist; rolling in bed, the body presses the upper limb underneath the body, forcing the elbow joint to overextend and other external forces caused. 2.After the injury, the affected limb is not willing to be lifted up and the forearm cannot be rotated back. 3.The elbow joint (in extension) is mostly in mild flexion position and forearm rotation forward and down position. 4.No swelling or deformity of the elbow joint, but there is obvious pressure pain at the radial tuberosity. 5.X-ray film is not abnormal. Complications Although the injury of radial tuberosity subluxation is not serious, it also affects the function of elbow joint, and most of the patients need to reset to get healed. However, the results of treatment are generally good and no complications occur. Some children who are not seen in time may have a longer recovery time, but again no complications occur. Treatment: The treatment of this disease mainly relies on manual repositioning, the correct repositioning method without traction, inappropriate traction but easy to make the repositioning failure. No anesthesia is used for the reset, and the elbow joint is rotated from extension to flexion of the forearm, and a popping sensation at the humeral radial joint can be felt when the reset is successful. After reset, the elbow and forearm can move freely and there is no obstacle to forearm lifting. Prevention: 1. When pulling (lifting) the child’s hand in general, pull the sleeve at the same time. 2.Prevent falling. 3.Adults should pay attention to the method when playing with children and should not hold (lift) the hand alone. 4.If the above-mentioned performance occurs, parents can reset the hand by themselves, but if it is unsuccessful, they should go to the hospital for consultation. 5.Avoid repeated dislocation and formation of habitual. 6.When putting on clothes, the hand should be avoided to be pulled in a rotating forward position, and the sleeves should be pulled at the same time.