Arthroscopic surgery for synovitis of the knee is usually taken with lumbar anesthesia. Arthroscopic knee synovectomy is a proven minimally invasive surgical treatment for a variety of synovial diseases, such as rheumatoid arthritis, choroidal nodular synovitis, and synovial chondromatosis. Knee arthroscopy is performed under lumbar anesthesia, a tourniquet is placed at the root of the thigh to control bleeding, a working channel is visible on the anterolateral and anterolateral side of the knee, and an arthroscope is inserted to determine the location and extent of the lesion, and then a planer knife and radiofrequency are used to clean up synovial membranes and stop hemorrhage, and a grinder drill is used to grind off the hyperplastic bone. For meniscus tears, cruciate ligament ruptures, etc., there are specialized tools to repair them. With symptoms of knee synovitis, patients are advised to seek timely medical attention and should follow the doctor’s instructions and actively cooperate with the doctor to avoid delays.