Bone discontinuity is a fracture that has been treated for more than a certain amount of time (usually about a year) after the fracture has not grown on and the fracture line is still clearly visible. The reasons are generally the following: poor soft tissue conditions on both sides of the fracture end, poor blood supply to the bone, which affects the healing of the fracture; the granulation tissue filled in the fracture end is not transformed into bone tissue, which becomes useless scar tissue and limits the growth of bone cells into it; the fracture is damaged by high energy, the bone cells at both ends of the fracture are scalded and gradually absorbed, the fracture line is too wide, and it is difficult for the bone cells to crawl; other factors such as poor fixation, inflammation, and other physical or chemical factors. In my personal experience, if the fracture line is still visible after more than six months, we should consider removing the scar tissue between the fracture lines and implanting fresh bone tissue.