I. Diagnosis Double fractures of the ulnar radius are most often seen in adolescents. Direct and indirect (conveying or twisting) violence can cause double fractures of the ulnar flexor shaft. Post-traumatic pain and impaired movement of the forearm, X-rays can clarify the type of fracture and displacement. Photographs should include the elbow and wrist joints to understand the presence of rotational displacement and upper and lower ulnar radial joint dislocation. II. Treatment Double fractures of the ulnar radial stem require correct alignment of the proximal and distal segments of the two bones, correction of the four deformities, and restoration of the physiological length of the two bones. This kind of fracture is more difficult to reset, and it is easy to dislocate after reset. However, the combined experience of Chinese and Western medicine in treating the fracture proves that the manual orthoprosthesis and proper external fixation can cure most cases. The treatment of pure ulnar or radial fracture is the same. 1. Reset is difficult and demanding, and it is easy to displace after reset. (1) Children’s green branch fractures mostly have angular deformity, which can be corrected by gentle traction under proper anesthesia and plaster fixation for 6-8 weeks. The angular deformity can also be corrected with a plaster wedge incision. (2) With displaced fractures, the overlap and angular deformity are first corrected by longitudinal traction, and the forearm is placed in a rotated posterior position under continuous traction if the upper 1/3 of the fracture is tethered (above the stop of the anterior rotator muscle); the lower middle 1/3 of the fracture (below the stop of the anterior rotator muscle) is placed in a rotated neutral position to correct the rotational deformity. The fracture is then compressed at the fracture site to restore interosseous membrane tension and normal clearance, and finally the fracture end is fully aligned. After repositioning, the fracture is fixed with a long-arm plaster tube type for 8-12 weeks, and the plaster is cut and released immediately after molding. During fixation, the blood circulation of the extremity should be observed, and the ring prevents ischemic contracture from occurring. After the swelling subsides, adjust the external fixation tightness in time and pay attention to observe and correct the fracture re-displacement. 2.Open reduction internal fixation. It is suitable for those who have failed in manual repositioning or have difficulty in fixation after repositioning; those who have ruptured interosseous membrane in multiple fractures of upper limbs; those who have open fractures with light contamination for a short period of time after injury; those who have limited function of bone nonunion or deformity healing.