The dangers and side effects of arthroscopic surgery include intra-articular infection, pain, limited mobility, deep vein thrombosis of the lower extremities, and anesthetic risks. 1. Intra-articular infection: Post-arthroscopic infection is uncommon, but once it occurs, it is often serious. For example, when knee arthroscopy is performed, it will enter the joint cavity, which may be infected due to the lack of strict aseptic operation and improper operation. 2. Pain and activity limitation:Although minimally invasive surgery incision is small, but in synovectomy, meniscus repair and other more complex arthroscopic surgery, it will cause joint pain, swelling, and even knee activity limitation, the recovery time is long, usually takes about 6 to 8 weeks. 3. Deep vein thrombosis of the lower limbs: mostly caused by too much time in bed, hypercoagulable state of blood, etc., with pressure pain and swelling of the affected limbs as the main symptoms. 4. Anesthesia risk:The surgical process requires anesthesia, and those who are allergic to anesthetics are prone to respiratory arrest, cardiac paralysis and other symptoms. If anesthesia is overdosed, it may even cause poor blood circulation and breathing difficulties. After arthroscopic surgery, we must follow the doctor’s instructions for care and rehabilitation, to reduce its complications and facilitate the recovery of the condition, if there is any discomfort, timely review.