Mild synovitis does not require surgery, while severe synovitis requires surgery, as follows: First, patients with mild synovitis will have swollen joints and joint pain, which can be treated with ultrashort wave therapy, microwave therapy, and nonsteroidal medications that can improve synovial inflammation. Non-steroidal drugs are usually chosen from celecoxib, loxoprofen sodium, etc. The patient also needs to be accompanied by joint rest. Second, in severe synovitis, which can be characterized by severe joint swelling, pain, and limited motion, minimally invasive arthroscopic surgery or arthroplasty should be considered. Arthroscopic surgery can remove the inflammatory synovium, which is less disruptive to joint function and results in a faster recovery. Arthroscopic surgery is mainly suitable for patients with synovitis and severe osteoarthritis. In these patients, the use of artificial joint replacement can significantly improve the patient’s quality of life because the joint function has almost failed.