The classification of bone discontinuity: bone discontinuity can be divided into hypertrophic, sclerotic and atrophic types, but most patients are mixed bone discontinuity. The cartilage cap of the broken end is usually considered to have the characteristics of epiphyseal cartilage, and the rate of cartilage generation and cartilage ossification form a dynamic balance, so the fracture gap exists for a long time. In hypertrophic osteochondral discontinuity, the fracture end is often enlarged to both sides, forming an “elephant foot sign” or a ball-like change. 2.Sclerotic bone discontinuity has a closed medullary cavity and hardened ends. 3, atrophy-shaped bone discontinuity atrophy of the broken ends become thin, mainly for the fiber connection. 4, mixed type of bone discontinuity often both hypertrophy, sclerosis or both atrophy, sclerosis of the performance. From the point of view of treatment hypertrophic bone discontinuity is more treatable, atrophic type is more difficult to treat, if there is a pseudo-joint is particularly difficult to treat. Since there is no way to transform fibrous and cartilaginous tissue into bone tissue, the most common method used in Western medicine is to remove fibrous and cartilaginous tissue, open the medullary cavity or remove the sclerotic end, and then add bone grafting to treat bone discontinuity. However, the surgical results are not very satisfactory, and in some cases, multiple surgeries are not successful. Nowadays, some people add bone morphogenetic protein BMP to the surgery to treat bone discontinuity, some people use BMP plus red bone marrow injection to treat bone discontinuity, some people use ultrasound treatment, some people use gold glucose injection to treat bone discontinuity, and there are also a few reports of using herbal medicine to treat bone discontinuity. The number of treatment methods indicates that the existing treatment methods are not very effective and even become an orthopedic problem. At present, there are two recognized treatment methods with positive results: microsurgical methods for bone flap transplantation, and external fixation frame for bone removal by distraction. The rational application of these two methods provides a convincing means of curing non-healing fractures with bone nonunion.