If the scar area is large and cannot be completely removed, only the scar is loosened by surgery to correct the deformity and dysfunction caused by the scar, the surgery is performed on the basis of the scar, and in principle, one year is better, when the scar is less congested and less bleeding during surgery, the scar is soft and easy to operate, the postoperative healing is fast and the survival rate of the implant is high. However, if the scar can be completely removed by small surgery, there is no time limit, such as point or linear scar. In addition, if the scar contracture causes serious functional abnormalities or disorders, or affects the skeletal development of children’s joints, the surgery should be performed as early as possible and should not be bound to the post-injury time.