The fracture of the tibia may not heal because of the following factors: 1. From the human anatomical characteristics, the muscles and soft tissues of the lower and middle tibia are thin, especially in the anterior tibia, and the blood circulation supply is worse than other parts of the body, so the fracture growth in this area is slower than in other blood-rich areas, and the recovery time will be extended accordingly. 2. If the contact area of the fracture end is less than 1/2, there is a high possibility of delayed healing or even non-healing of the distal fracture.3. Complex tibial fractures are fixed by incision or limited incision and internal fixation, and further trauma to the damaged periosteum during the surgical operation and artificial destruction of the surrounding soft tissues will also increase the possibility of non-healing.4. Premature movement on the ground after tibial fracture leads to micromovement of the fracture end that is still not healed. The fracture will not heal for a long time.