Minimally invasive arthroscopic surgery is characterized by minimal trauma, delicate operation and fast recovery, so arthroscopic surgery has become the treatment of choice for managing joint sports injuries and joint diseases. In particular, knee arthroscopy has become a very mature surgical procedure. Knee arthroscopy is incomparable for subsurface membrane cleanup, treatment of meniscal 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 to take? 1. Wound treatment: The knee arthroscopy wound is just two or more small incisions of less than 1 cm, 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 long time to soak the wound just removed in a tub bath, and do not scrub the wound with a bath towel or uncover the scab on the wound, but wait for it to fall off naturally. 2, pay attention to rest: arthroscopic wounds and joint cavity trauma in the postoperative period in the inflammatory edema period, 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 rest can be taken in a flat position, with the patient padded with a towel or pillow, which is beneficial to the swelling of the knee joint. 3. Pay attention to observe the movement, sensation and blood flow of the distal end of the affected limb: After surgery, in order to prevent blood and fluid accumulation in the joint cavity and short-term joint swelling after surgery, the wound should generally be placed in a sterile cotton pad with pressure bandage, and after returning to the ward, closely observe the fluctuation of the dorsal foot artery and peripheral blood circulation, skin temperature and sensory movement, promptly remove the auxiliary materials that have become hardened by blood soaking, and prevent the fixation from being too tight due to limb swelling. If purple color, low skin temperature, numbness, swelling and pain are found at the extremity, it means that the bandage is too tight, and the doctor should be notified promptly to give loosening. 4. Post-operative rehabilitation training: histologically fibrosis appears early after knee injury, if not early activity, about 4 days of time can appear joint movement restrictions, injury joint fixation, 2 weeks that may lead to connective tissue fusion, so that the joint loss of function. Early functional exercise can improve and increase local blood circulation, increase muscle strength, and restore joint and limb function. In 3-5 days after surgery, patients are encouraged to get out of bed with the help of crutches, but are not encouraged to walk more, in order to reduce pain and swelling, prevent deep vein thrombosis in the lower limbs, and restore normal joint activities as the purpose, and patients are instructed to take active exercise as the main principle and passive exercise as the supplement, and gradually increase the exercise time. 5.Follow up on time: Follow up regularly according to the time ordered by the doctor at the time of discharge. The surgeon will combine the intraoperative situation with the postoperative recovery to give the patient some suggestions to help the patient recover better. Some tests will also be done to determine recovery if necessary. If there is persistent postoperative swelling and pain that keeps getting worse, or if there is still symptoms such as interlocking or popping, you should visit your doctor promptly to find out the cause.