Dislocation of the baby’s arm is very common in clinical practice, mainly due to the child’s radial head subluxation, which is also very common, mainly due to the child’s strenuous activity, the upper limb is pulled by the parents, especially in the process of going up and down the stairs, due to the parents pulling the child’s upper limb violently and dislocation of the elbow joint, manifested by the child’s sudden emergence of pain in the affected limb, the upper limb can not The child suddenly experiences pain in the affected limb, cannot lift the upper limb, and cannot hold a pen or grasp an object with the affected hand. It is very necessary to go to the hospital promptly. X-rays can not be done because there are no obvious positive signs in the imaging, and it is recommended to give the child a manual reset immediately, after which the child’s arm can be lifted up and the hand can grasp objects and make fists.