Right knee synovitis can be categorized into rheumatoid, pigmented villous junction, bony and other types of lesions, which can be treated by drugs such as celecoxib or surgery. 1. Rheumatoid synovitis: rheumatoid arthritis can cause secondary synovitis, i.e. rheumatoid synovitis, with pain and swelling of the knee joint, which can be treated by methotrexate and other medicines alone or in combination with anti-rheumatic drugs, as well as anti-inflammatory and pain-relieving medicines such as Celecoxib, and extraction of accumulated fluid by puncture of the joint cavity. 2. Pigmented villous junction synovitis: the knee joint ferritin is phagocytosis caused by phagocytosis cell proliferation can form pigmented villous junction synovitis, easy to appear bloody joint effusion, generally through arthroscopic synovectomy or villous resection and other surgical treatment. 3. Osteosynovitis: joint degeneration causes wear and tear of articular cartilage and osteophytes, resulting in osteosynovitis, patients have symptoms such as joint swelling, fluid accumulation and activity limitation, generally treated by extracting the fluid and using drugs such as celecoxib to reduce inflammation and pain relief. Patients diagnosed with synovitis of the right knee need to identify the cause of the disease and make a comprehensive judgment in order to get an effective treatment plan. The use of medication should be under the supervision of a doctor.