Diagnosis of double fracture of the ulnar radial trunk: pain and impaired movement after trauma to the forearm, and x-rays can clarify the type of fracture and displacement. Photographs should include the elbow and wrist joints for the presence of rotational displacement and dislocation of the upper and lower ulnar radial joints. Patients with this disease mainly present with local swelling, deformity, and pressure pain, and may have bone rubbing sounds and abnormal activity, and limited forearm movement. In children, the fracture is often a green branch fracture with angular deformity without displacement of the bone ends. Sometimes combined with injury to the median nerve or ulnar or radial nerve, attention should be paid to the examination. Double fractures of the ulnar radial trunk can occur with lateral displacement, overlap, rotation, and angular deformity and are more complicated to treat. The type of fracture due to different forms of violence is also different, and a spiral type of double fracture of the ulnar radius occurs. The fracture line is in the same direction, mostly with the ulnar bone sloping upward to the radius outward. What are the causes of pain after trauma to the forearm: ulnar radial spiral double fracture: this fracture is second only to the distal radius fracture in forearm fractures, and the treatment is more complex, the prognosis is poor, one of the clinical problems, should be paid attention to. Throwing fracture: throwing is a violent high speed athletics, its movement mainly occurs in the shoulder and elbow joints, but requires the synergy of the joints and muscles of the upper and lower limbs and trunk. Throwing injuries can occur in throwing events such as soldier bomb training, javelin, discus, and chain ball, as well as in ball events such as baseball (pitcher) and tennis. Fracture of the ulnar radius stem: The ulnar radius is the two long bones of the forearm, and the ulna is located on the medial side of the forearm and is the longer bone, which can be divided into two ends of one piece. It is located on the side of the little finger and is more likely to fracture. Double fractures of the radius and ulna are very common and occur in adolescents. Double fractures of the ulnar radius can occur with four deformities: overlap, angular rotation and lateral displacement. Single fractures of the ulnar trunk are rare because they are not significantly displaced by radial support, unless combined with dislocation of the inferior ulnar radial joint. They are usually caused by direct, indirect, or torsional violence. Fractures of the radius and ulnar styloid process: This is a rare condition in which the palm of the hand lands on the ground during a fall and the impact force acts on the lower radius via the navicular bone to cause a transverse fracture of the radial styloid process. There are also injuries caused by direct impact, such as car handle backlash. In addition, strong ulnar deviation of the wrist joint and strong pulling of the radial collateral ligament can cause avulsion fracture of the radial styloid process. The fracture is small and displaced distally. Fractures of the ulnar styloid process are often associated with ligamentous strain and are often associated with Colles fractures, but can also occur as a single fracture.