1, the role of ice: ice can constrict blood vessels, reduce bleeding and tissue fluid exudation in the joint, to achieve the purpose of reducing swelling and analgesia. 2, the production of ice bags: ice can be prepared at home in the refrigerator freezer. Ice cubes into a plastic bag with the right amount of water to form a mixture of ice and water, excluding the air inside the bag, sealed, a simple ice bag will be made. Patients are recommended to use this type of ice bag, which is more suitable for the temperature and more environmentally friendly. Patients are not recommended to use this repeated freezing and thawing type of ice bag, its temperature is not good control, easy to frostbite, and after freezing the ice bag is hard, not easy to fit the joint skin. Timing of icing: icing can be started after the dressing is removed. The elastic bandage does not affect the ice pack. Ice must be applied after each angle exercise. Time of icing: Each icing time is 20 minutes, usually three times a day. If the joint is continuously swollen and hot, the number of icing times can be increased appropriately. The location of ice: that is, the surgical site, do not move the position of the ice pack when icing. A thin layer of cloth can be placed between the skin and the ice pack when icing to prevent the moisture on the surface of the ice pack from wetting the wound. Before the wound heals, if you find that the dressing is soaked after icing due to the leakage of the ice pack and other reasons, then you should go to the hospital to change the dressing and disinfect it to prevent infection.