When choosing an artificial joint, the following points should be taken into account: 1. your expectations of reconstructed joints: ordinary artificial knee replacement surgery can significantly improve the pain and function of serious knee diseases and restore basic self-care; some specially designed artificial prostheses can also meet certain special requirements of patients such as kneeling and cross-legged; 2. the age of the patient: more than 90% of ordinary artificial prostheses can be used The latest design and materials of artificial knee prosthesis can withstand wear and tear for more than 30 years in vitro, which is suitable for younger patients; 3, financial ability to pay: the more requirements you have, the higher the cost you need to pay, although some requirements are not necessary. Medical preparation: 1. Examination: such as blood sample collection, ECG, X-ray, urine sample; 2. Skin preparation: protect the skin in front of the knee before surgery; 3. Blood transfusion; sometimes blood preparation is required depending on the patient’s needs; 4. Medications: tell your orthopedic surgeon which medications you are currently taking, and the surgeon will advise you which ones need to be stopped; 5. Lower extremity examination: if you have previous lower extremity burns and infections, be sure to tell If you are overweight, your doctor will advise you on how much weight to lose before surgery to reduce the stress on your new knee joint; 7. urinary tract examination must be performed before surgery. Elderly people with prostatitis disease must undergo urinary tract examination and treatment before surgery; Exercise for crutch use before surgery. After hospitalization, the attending surgeon will talk to you about prosthesis selection and post-operative precautions; the ward nurse will provide you with basic and specialized care.