Ice packs can be applied after a fracture. Ice packs can lower the local pain threshold and have the effect of relieving the local pain of the fracture, and can also constrict the local blood vessels, which can reduce the local swelling and also control the further aggravation of the swelling. In addition, it is generally recommended to apply ice 1-2 days before the early stage of the fracture or within 48 hours after the fracture surgery to prevent further increase of swelling. It is recommended to use an ice and water mixture to apply topically, with a thin cotton cloth on the surface of the fracture site to prevent direct contact of ice with the skin surface and to prevent frostbite from occurring. If there is a local wound, the wound must be strictly bandaged before ice is applied.