Total knee replacement is a very efficacious procedure, but there are a number of risks that patients must be aware of before surgery. 1. Life-threatening condition caused by postoperative fat embolism or blood clots. 2. Postoperative infection. 3. Most of the patients with total knee replacement are old people, many of them have diabetes, heart disease, high blood pressure and other old age diseases. Improper preoperative or postoperative treatment will induce the onset or aggravation of these diseases or lead to the occurrence of serious complications related to these diseases, which will bring harm to the patients. 4. The postoperative situation of the elderly with total knee replacement is more complicated, if there is no mature and standardized means of protection to deal with various emergencies, it will also bring unnecessary risks to the patients. 5. Some doctors do not have much experience in surgery, and the number of surgery cases is not enough, which leads to unsatisfactory position of the artificial joint during the operation, and lays a hidden danger for the possibility of a second operation in the future. 6. Lack of systematic and effective postoperative rehabilitation guidance, resulting in unsatisfactory postoperative functional recovery. However, the above risks can be well solved by a doctor and a team with a certain amount of experience in total knee replacement.