The upper limb external fixator system is suitable for older children with open fractures of the ulna and radius,proximal humerus,unstable reduction or obvious swelling. Advantages 1.It can be adjusted flexibly according to the reduction requirements,easy to operate,less bleeding,easy to care. 2.It will not aggravate the damage to the blood supply,periosteum and soft tissue of the fracture end,improve the fracture healing rate,and reduce the postoperative infection rate. 3.The small fragment ex fix is firm.It restores and maintains the length of the limb by extension and ligament extrusion,and reduces the comminuted fracture fragments. 4.The rotational axis device and removable characteristics of the humeral external fixator can adapt to the fixation strength required by fracture healing in different periods.The humeral external fixation allows the shoulder joint to gradually increase the range of motion, which is conducive t…