After the fifth metatarsal fracture must be cast, if there is obvious displacement of the fracture broken end, need to be manipulated first, then the fracture position of the cast immobilization. If there is no obvious displacement of the fracture, the fracture can be immobilized in a cast directly, because the cast can maintain the stability of the injured position, the fracture heals faster, and the surrounding damaged soft tissues can relax and rest as soon as possible, eliminating the edema, as well as bruising and swelling, which plays a very positive role in the recovery of the fracture. If you don’t put a cast on, the human body will have subconscious activities, and the fracture will have stress reaction, which will lead to hardening of the fracture or gradual atrophy of the fracture, delayed healing or non-healing, affecting the healing of the fracture, and may form chronic aseptic inflammatory foci, which is prone to pain whenever you are exposed to cold and exertion.