The specialty of sports medicine and minimally invasive arthroscopic surgery is currently developing rapidly in China. Minimally invasive arthroscopic surgery is characterized by small trauma, delicate operation and fast recovery, so arthroscopic surgery has become the treatment of choice for dealing with joint sports injuries and joint diseases. In particular, knee arthroscopy has become a very mature surgical procedure. Knee arthroscopy is incomparable for subsurface membrane cleaning, dealing with meniscus injuries and cruciate ligament injuries than conventional open surgery. So what do patients need to do when they return home after knee arthroscopy? What are the precautions? Knee arthroscopy here refers to some of the conventional surgeries such as microscopic cleaning and partial meniscectomy (meniscal suturing and anterior and posterior cruciate ligament reconstruction are partly the same for patients after surgery, but there is a more detailed rehabilitation plan) 1. How is the wound treated? The knee arthroscopy wound is simply two or more small incisions of less than 1cm, which are closed with stitches or cosmetic tape after surgery. After discharge from the hospital, the wound needs to be kept clean and dry and disinfected every 3 days or so at a regular hospital or clinic. Since the incision is located at a movable joint, the stitch removal time is usually extended to about 2 weeks after the surgery, and the stitches are removed or the cosmetic tape is removed at the hospital. Generally, after 24-48 hours after the stitches are removed, you can take a normal shower without fear of wetting the wound. However, do not take a bath for a long time to soak the wound that has just been removed, and do not scrub the wound with a bath towel or remove the scab on the wound, but wait for it to fall off naturally. 2. Should I be more active or rest after arthroscopic knee surgery? The most important concern for patients is how to heal better after arthroscopy and better restore lower limb function. The answer to this question may seem contradictory: you should rest and exercise at the same time. Arthroscopic wounds and intra-articular trauma are in a period of inflammation and edema after arthroscopy, so excessive activity stimulation is not conducive to wound healing and edema elimination. During the 2-3 weeks after surgery, it is recommended not to walk or jog too much, nor is it recommended to stand or sit still for long periods of time. Daily necessary walking is possible, and resting can be done in a flat position with the patient elevated on a towel or pillow, which is beneficial to the swelling of the knee joint. However, post-operative rehabilitation is also a very important part. The rehabilitation exercise here is not to run as we think, but to do scientific rehabilitation training for joint mobility, lower limb strength, gait and proprioception (such as balance and other functions), specific rehabilitation exercise suggestions will be launched later. 3.Does the joint need ice or heat? First of all, we need to understand the role of ice and heat. Ice can be a good means of analgesia, for example, we see that after a player is injured on the soccer field, the team doctor will spray aerosol on the affected area, this aerosol is actually a low temperature refrigerant, by quickly reducing the temperature of the affected area, to achieve the purpose of analgesia. Ice is also a good means of eliminating inflammation, by making the capillaries in the affected area constrict through low temperature and reducing inflammation exudation. The purpose of hot compresses is to promote faster absorption of the inflammation already produced. Therefore, during the recovery period, different modalities may need to be chosen in different cases. If there is significant localized redness and swelling of the knee joint, burning of the skin, more fluid and painful symptoms, or swelling of the knee joint after doing rehabilitation exercises, it is recommended to apply ice for half an hour after elevating the affected limb in a flat position. If there is no obvious discomfort and redness in the knee joint, you can use hot compresses to promote recovery. 4. What else can I do? After the stitches are removed, you can do massage on the local scar and the soft tissues around the knee to promote the softening of the scar and increase the elasticity of the local tissues. The mobility of the patella should not be neglected, so you can do left and right up and down nudges of the patella every day to help restore the function of the lower limb. In order to avoid the formation of chronic inflammation and chronic pain syndrome, some non-steroidal drugs can be insisted on for 2-4 weeks after surgery, which can help eliminate the inflammatory response of the knee joint and reduce the pain, and also help to carry out normal rehabilitation exercises after surgery. 5. About the follow-up examination. It is quite important to follow up regularly according to the time ordered by the doctor at the time of discharge. The surgeon will give the patient some suggestions to help him/her recover better according to the combination of the intraoperative situation and the postoperative recovery. Some tests will also be done to determine the recovery if necessary. If there is persistent swelling and pain after surgery that keeps getting worse, or if there are still symptoms such as interlocking and popping, you should visit your doctor promptly to find out the cause.