Generally, after bone grafting, you can see the growth of bone scab in 1~2 months, and the fracture can be healed in about 3 months. A bone nonunion is a fracture that has not healed for more than 9 months is called a bone nonunion. Patients with nonunion will usually take bone grafting surgery to promote fracture healing, after bone grafting surgery, under normal circumstances, the bone scab can be formed in 1~2 months, and the fracture line is blurred or disappeared in about 3 months, and the fracture is basically healed. Factors that cause bone nonunion include poor blood supply at the fracture end, serious soft tissue injury, infection and poor nutrition, etc. Therefore, after bone grafting surgery, patients need to rest, avoid weight bearing on the affected limbs, and pay attention to the nutritional richness of the diet, and eat more food with high calcium content and rich vitamins, etc., to promote the formation of bone scabs, and the fracture healing as soon as possible. Patients after bone grafting should actively cooperate with the doctor to promote early recovery.