This kind of ulnar osteoconnection has already failed two times of plate internal fixation, the residual “honeycomb” nail hole at the broken end, residual broken nail, sclerosis, and then plate fixation is wrong, it will further damage the blood flow, and the fixation is not firm. The more reasonable surgical method is to use locking intramedullary nail with bone graft for ulnar bone discontinuity. In the case of an infected ulnar osteochondral nonunion, the initial surgery was performed with internal fixation of the plate, and later recurrent drug-resistant Staphylococcus aureus infection occurred. We removed the plate and filled the fracture end with bone cement containing gentamicin and vancomycin, and the infection was quickly cured. 8 months later, we performed another plate internal fixation with a three-sided cortical iliac bone graft, which healed smoothly. The treatment of several cases: 1, ulnar radial bone discontinuity are defective: you can remove the sclerotic bone, allow the fracture end to be removed up to 4 cm, so that the length of the two bones are the same, plate fixation + bone graft or ulnar intramedullary nail, radial plate fixation . The upper extremity allows a greater margin of length deficit, so more sclerotic bone can be removed appropriately to facilitate healing, and the patient needs to be explained clearly and signed in advance. Avoid misunderstanding and doctor-patient disputes. 2, the above method will make too much forearm shortening, ulnar radius should be treated separately: small defects do not do too much shortening, large defects implant bone bridging. If the defect of ulnar radius is large, both need to be bridged. The best material for bridging is autogenous fibula, I have emphasized the advantages of autogenous fibula many times, and it also needs to be explained clearly in advance. The next best material is iliac bone with three sides of cortical bone. 3, When one bone had an infection, do the non-infected bone first, and then deal with the other bone alone radial or ulnar bone discontinuity at an interval of several weeks. 4, a bone defect and another bone is normal, the bone defect will be difficult to heal – bridging the bone defect is better than shortening the normal bone.