Supracondylar fractures of the humerus are commonly seen in adolescents, also called green branch fractures, of which the extension type supracondylar humerus fractures account for more than 90% and the flexion and comminution types are less common. After clinical repositioning, it is necessary to do palmar grip and extension exercises under external fixation, specifically: 1. the next day, start to increase the wrist flexion exercises, as well as the anterior, posterior, left and right swing exercises of the shoulder when the affected limb triangle is suspended in the chest position, with the aim of avoiding the emergence of restricted shoulder joint activities; 2. a week later, increase the active exercises of the shoulder, including shoulder flexion, extension, adduction, abduction and shrugging, and day by day After the healing of the supracondylar fracture of the humerus, the exercises of joint mobility should be started, which mainly includes flexion and extension, forearm rotation and post rotation. The active range of motion is the range of motion that can be achieved without any external force; the passive range of motion is the range of motion that can be achieved with the application of external force. After the supracondylar fracture of the humerus, once the joint mobility training is entered, it is inevitable to intervene in the external force to increase the range of motion of the joint, whether it is the angle of flexion or extension, including the angle of forearm rotation forward and rotation backward, the first thing to do in the process is to maintain a relatively fixed posture without increasing the angle of rotation of the supracondylar humerus, and artificially increase the angle of flexion of the elbow joint to achieve the normal range of motion .