Many times patients are confused: How can there be fluid in a good knee joint? In fact, this is called synovitis of the knee. What is synovitis of the knee? Synovitis is a non-infectious inflammatory disease that occurs when the synovial membrane is damaged or torn by 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 traumatic synovitis and chronic injury synovitis. Acute traumatic synovitis occurs mostly in young people who are athletic. Chronic injury synovitis occurs in middle-aged and elderly people, those who are obese, or those who use their knee joints excessively. General treatment of knee joint effusion: 1.Puncture therapy: When there is more joint effusion and high tension, joint puncture can be performed to completely remove the effusion and blood and inject sodium hyaluronate, which is the main component of joint synovial fluid, into the joint cavity. 2.Local closure therapy: Closure therapy, also called “local closure”, is a method of pain treatment evolved from local anesthesia. 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. Closed therapy is a simple, safe and reliable treatment method to relieve pain or discomfort in patients with osteoporosis. 3.Rehabilitation: In the early stage, bed rest should be taken, the affected limb should be elevated, a slight compression bandage can be used, and weight bearing should be reduced. Quit smoking and alcohol. Appropriate physical therapy, Chinese medicine treatment. During the treatment period, the quadriceps muscle can be relaxed and exercised, straight leg upward elevation exercise; later should strengthen the knee flexion and extension exercise, which has a positive effect on eliminating joint effusion, preventing quadriceps muscle atrophy, preventing recurrent synovitis, and restoring knee extension and flexion function. 4, exercise therapy: patients should develop the habit of exercise, but be careful not to overdo it. The knee is the most weight-bearing joint in the body, and overload can easily cause arthritis. Once the disease has developed, you should not stop exercising completely, as long as you adjust the amount of exercise according to the situation, in fact, a certain amount of exercise is beneficial to the recovery of knee arthritis. 5, drug treatment: acute synovial injury, to activate blood circulation treatment, such as inflammation, the need for simultaneous anti-inflammatory treatment. Such as the application of celecoxib capsules, diclofenac sodium extended-release tablets and other non-steroidal anti-inflammatory drugs; if combined infection is considered, penicillin, cephalosporin antibiotics can be applied to treat. 6.Minimally invasive arthroscopic treatment: Minimally invasive arthroscopic treatment of synovitis is currently a more advanced international technology for the treatment of various orthopedic joint diseases, which can achieve very good results and help patients get rid of the disease as soon as possible. Compared with traditional open surgery methods, minimally invasive surgery treatment technology has the advantages of less trauma, faster recovery, and does not destroy the normal structure of the joint.