Ankle sprains with ligament injuries in a cast for four weeks can usually be removed straight away, but rehabilitation may be required after removal. Ankle sprains often occur after a broken foot. If the injury is more pronounced it needs to be immobilized and protected with a cast. According to the natural law of ligament repair, healing is usually complete at four weeks and the cast can be removed. However, if combined with an avulsion fracture, this may be extended to three months. However, removing the cast is not equal to the patient’s full recovery. Many patients may have problems such as stiffness, poor strength and decreased stability of the ankle joint, which require standardized rehabilitation therapy under the guidance of a doctor for a better recovery. In addition, patients who have just had their casts removed need to move or exercise in a gradual manner, avoiding high-intensity, high-confrontation sports to prevent secondary injuries. Because of the individual differences between patients, so ankle sprain ligament injury cast four weeks whether it can be directly unloaded or recommended to consult with a doctor, do not remove yourself, rehabilitation therapy needs to be carried out under the guidance of a doctor.