Patients come to the hospital for surgery, according to the rules can not be taken away, the hospital to deal with. Amputation is divided into minor and major amputation. Minor amputation is the removal of infected and necrotic tissue at the same time, refers to open partial amputation by partial revascularization or limb correction, limited removal of some tissue. Major amputation is is due to the inability to mitigate a severe disease state through revascularization, medication control, or minor amputation. Major amputations are categorized as low or high amputations, with low amputations typically being performed from 10 centimeters below the knee, while high amputations require amputation from the base of the thigh. The mortality rate of patients with high amputation is more than 50% within two years and more than 80% within five years. These survival rates are for amputations due to osteosarcoma and bone cancer. Survival rates for amputations due to normal causes (e.g., accidents, car accidents, etc.) are basically the same as for normal people.