Our goals are broken down into two scenarios. The first scenario is the first post-operative day when the surgeon and rehab physician have achieved this goal when they are doing passive ankle motion on the patient, and the subsequent goals are simply to maintain this status quo. In the other case, the patient did not receive proper rehabilitation instructions early on, and a goal is needed when doing these remedial efforts. It is impossible to push the dorsiflexion of the ankle joint to 30 degrees at once, because one of the reasons is that the patient cannot stand it, and the other is that the force is so great that new additional injuries will occur, the most serious being the peeling of the cartilage of the ankle joint. This injury is so serious that it causes new pain and suffering to the patient and becomes a medical source of damage. This is inconsistent with the original intention of our treatment, so the exercise still needs to be gradual, little by little.