The artificial knee joint replacement surgery has been widely carried out in many large hospitals in China, and many patients have seen the good results after the surgery from apprehension and fear to gradually accepting the surgery, and after the surgery many patients have told me from the bottom of their hearts: “The fear and apprehension before the surgery and all kinds of concerns are really superfluous, so much so that due to the fear of surgery and suffered for many years. The pain was so great that it even seriously affected their daily life”. I also often ask patients after surgery, especially older patients, “Is this knee replacement surgery worth it and what are the results?” They almost always reply with a smile, “It’s worth it, it’s worth it, I would have done it a long time ago if I had known it was going to be like this. However, many of my patients and their families do ask me many questions before and after surgery that they are concerned about and would like to know about, and many of my online friends also ask many questions about this. In order to let you understand some of the recovery situation after surgery, I will try to use common language rather than medical language for you to understand, combining my years of experience. I. Is it very painful and unbearable after surgery? Artificial knee replacement surgery is a system engineering surgery, and experienced doctors will seriously consider the patient’s post-operative pain in addition to completing the surgery very well. Normally, I give my patients an intravenous pain pump after surgery. This pain pump can be used 24 hours a day to provide pain relief from the intravenous pain medication. As we all know, the 3 days after surgery is the peak period of pain, because of the use of pain pump patients can basically relieve the pain, will not endure the severe pain of the wound after surgery, after 3 days will also take some oral pain medication in order to carry out joint rehabilitation exercises, patients in the post-surgery hospitalization period we will carefully analgesic treatment, so that patients do not suffer from pain during recovery. Secondly, when to start joint rehabilitation exercises after the surgery, the general joint rehabilitation exercises should be started as soon as the anesthesia disappears. After the anesthesia disappears, we will instruct the patient to actively perform foot flexion and extension exercises. Foot dorsiflexion and quadriceps contraction exercises