Type: 3 types. type I: most common, ulnar fracture is palmarly oriented with anterior dislocation of the radial head. Type II is the opposite of type I. Type III: ulnar trunk fracture with lateral dislocation of the radial head. Mechanism of injury: not very clear. Clinical symptoms: post-traumatic injury resulting in functional impairment of the elbow, limited rotation of the forearm, and symptoms of local swelling and pain. The old fracture is mainly functional impairment and cosmetic deformity. Diagnosis: mainly by x-ray examination. For upper middle 1/3 fractures a complete elbow radiograph must be taken to clarify whether the radial head is dislocated. Differential diagnosis: mainly congenital dislocation of the radial head. Lack of history of trauma, mostly bilateral, and developmental deformity of the radial head can be differentiated. Treatment: I: Fresh Manganese fracture: firstly, manual repositioning and plaster fixation are used. Generally fixed plaster to 5-7 weeks, pay attention to early and diligent review of the film, about 4 days and 1 week after routine repositioning. To prevent the radial head from re-dislocation leading to old Monsignor’s fracture. If the repositioning fails, surgical repositioning is used instead. For ulnar repositioning into the angle, 10° or less is acceptable. For old Monsignor’s fracture (usually after 2 weeks) 1. anatomical repositioning of ulnar osteotomy Old Monsignor’s fracture is very important for the repositioning of the radial head because the ulna has healed deformed, which hinders the repositioning of the radial head. The osteotomy site should be centered on the deformity, and the osteotomy can be divided into two types: wedge and oblique. We believe that oblique osteotomy is better, so the contact area of the fracture is large, which is conducive to the healing of the fracture. For internal fixation materials, there can be Kirschner pins, elastic intramedullary pins, etc. 2. For the treatment of the radius If the time is long, resulting in the humeral tuberosity on the radius growth restriction is lost, the radial tuberosity overgrowth occurs, affecting the reset, such as radial tuberosity resection will cause children’s elbow joint into the angle deformity and wrist joint deformity, children should not be used. We make shortening osteotomy fixation in the middle radius, which can reduce the damage to the nerve. The residual annular ligament and scar tissue embedded in the brachioradialis joint must be removed to properly reposition the radial tuberosity, and reconstruction of the annular ligament is essential to maintain the stability of the radial tuberosity. Most ligament reconstructions are performed by excising the triceps tendon membrane and wrapping the radial tuberosity around the base of the tendon membrane. However, some scholars believe that without repairing the annular ligament, the radial head can be maintained without dislocation by scar tissue a little. Complications of surgery: mainly the radial nerve dorsal side of that is the interosseous posterior nerve is damaged.