Knee arthroscopy has become one of the most common procedures in orthopedics. However, its complication rates remain unclear and most of the literature on complication rates dates back to the 1990s. With the update of arthroscopic equipment, technical improvements, and increase in the volume of procedures, the complication rate should also change considerably. Arthroscopic diagnosis includes meniscal injury, discoid meniscus, anterior fork injury, posterior fork injury, free body, intra-articular fracture, and synovitis. Arthroscopic procedures included meniscectomy, meniscal repair, anterior and posterior cruciate ligament reconstruction, synovial debridement, free body removal, microfracture, internal fixation of fracture, secondary exploration, and medial. All patients had 1 day of preoperative preparation outside of the initial emergency, and all procedures had the same team to complete. In principle, intraoperative tourniquets were not used, including ligament reconstruction and fracture fixation, and they were used only briefly in a few cases when bleeding control was required. A total of 6 doses of cephalosporin or broad-spectrum penicillin were administered preoperatively, at the end of surgery, and for 2 days postoperatively to prevent infection. At least 2 liters of solution was flushed into the joint cavity at the end of the procedure. Postoperatively, the patient was allowed to leave the bed and to exercise for rehabilitation. Patients were discharged when they regained the ability to walk, and all patients were hospitalized for at least 1 week, except for a very small number. No anticoagulants were used preoperatively or postoperatively. All patients wore elastic stockings and performed early functional exercises of the lower limbs. A total of 7 patients eventually developed complications, with an incidence of 0.27%, including 4 intraoperative complications (3 cases of intra-articular device damage and 1 case of meniscal injury) and 3 postoperative complications (2 cases of septic arthritis and 1 case of superficial infection). no nerve, vascular or ligament injuries, complex local pain syndrome, symptomatic deep vein thrombosis or pulmonary embolism were detected. 2 cases of septic arthritis were reoperated, and the infection The infection was controlled by arthroscopic irrigation and debridement. Complication rates have been reported in the previous literature, with the North American Arthroscopy Association in 1985 counting 118,590 cases of which 930 had complications, an incidence of 0.8%; a retrospective study of 4 operators who performed 2640 knee arthroscopies, 216 had complications, an incidence of 8.2%. Reported risk factors for complications included being black, being more than 30 days preoperative, having an operative time of more than 1.5 hours, and being 40-65 years of age; Bohensky et al. reported risk factors for poor knee healing including chronic kidney disease, myocardial infarction, cerebrovascular accident, and cancer. The complication rate in this study was 0.27%, and no embolism was observed, probably because the study determined embolism based on clinical signs and symptoms and did not perform ultrasound, which did not rule out asymptomatic embolism. The low complication rate of knee arthroscopy suggests that it is a relatively safe procedure, although previous literature has reported symptomatic embolism or death in high-risk patients, which still requires attention. Both cases of septic arthritis were successfully controlled after early arthroscopic irrigation and debridement, showing the importance of early diagnosis and early treatment, and the importance of postoperative clinical observation should be emphasized.