After a fracture occurs, the fracture needs to be fixed and braked, and the main purpose of using a splint and cast is to stop the activity and prevent the patient from moving. If the patient continues to move after the fracture, the new bone scab that grows between the fracture ends will break. Because this scab is fragile and not as resistant to fracture as normal bone, the fracture must be rested in bed for at least 1-2 months after it occurs. Under the fixation of splints, casts, braces, plates, screws, etc., it takes at least three months before you can walk normally, which is commonly referred to as 100 days of injury. If you walk on the ground too early, it will lead to bone scab fracture, plate bending, intramedullary pin bending, etc., resulting in fracture treatment failure and the need for secondary surgical treatment again, which will increase the pain.