Knee synovitis is a non-infectious inflammatory disease that occurs when the synovial membrane is damaged or ruptured as a result of acute trauma or chronic strain to the knee joint, resulting in the accumulation of blood or fluid in the knee joint cavity. It can be divided into acute and chronic. Acute cases tend to occur in young people who are physically active; chronic cases tend to occur in middle-aged and elderly people who are obese or overuse the knee joint for weight bearing. The main manifestations are swelling, soreness and even inability to walk in the knee joint, and ultrasound examination shows a large amount of joint fluid in the knee joint. For this disease, the following treatments are generally available: 1. Combination therapy: Early bed rest, elevation of the affected limb, compression bandage and prohibition of weight bearing. During the treatment period, the quadriceps muscle can be relaxed and exercised, and the flexion and extension exercise of the knee joint should be strengthened at a later stage, which has a positive effect on eliminating joint effusion, preventing quadriceps muscle atrophy, preventing recurrent synovitis, and restoring the knee joint extension and flexion function. 2.Puncture therapy: When there is more joint fluid and tension, joint puncture can be performed to completely remove the fluid and blood and inject sodium hyaluronate, which is the main component of synovial fluid, into the joint cavity. 3, closed therapy: closed therapy, also called “local seal”, is a method of treatment of pain evolved from local anesthesia. Closed therapy is a simple, safe, effective and reliable treatment method to relieve pain or discomfort in patients with osteophytes. The basic operation of closure therapy is to inject a mixture of local anesthetics and hormonal drugs into the painful area to achieve the purpose of anti-inflammation and analgesia. 4.Medication: In the acute stage of synovial injury, stagnation of blood stasis, treatment is mainly to disperse stasis and produce new swelling, if there is inflammation, anti-inflammatory treatment is needed at the same time. 5, minimally invasive surgery: minimally invasive treatment of synovitis is currently a more advanced international technology for the treatment of various orthopedic diseases, which can achieve very good results and help patients get rid of the disease as soon as possible. Compared with traditional surgical methods, minimally invasive surgical treatment techniques have the advantages of less trauma and faster recovery.