Displacement of the fracture in the first 70 days after fracture is rare, but there are special circumstances that can lead to displacement, such as re-injury that can lead to displacement of the fracture end and healing of the fracture end that can lead to displacement of the fracture end after re-fracture. After a period of healing the fracture end will form a bone scab, but the original bone scab formation is not so dense, after the violence may lead to re-fracture and lead to new displacement, etc., so after a period of fracture healing may lead to the fracture again displacement.