Synovitis (English name: synovitis), is a multifaceted disease that develops mainly in the knee joint. It can cause temporary or long-term partial loss of labor force, which is harmful to both the patient and society. At present, although there are many effective treatments, many patients are still not cured. In particular, some young and middle-aged patients have to bear many social and family responsibilities, while suffering from pain for a long time. This is undoubtedly a problem that urgently needs to be solved by our medical professionals. The knee is the joint with the most synovial membranes, the largest articular surface and the most complex structure. Because the synovial membrane of the knee is extensive and located in the superficial part of the limb, it has more chances to suffer from injury and infection. Such as meniscal injury, synovial injury, cruciate or collateral ligament injury, intra-articular injury and dislocation, knee osteoarthritis secondary to chronic synovitis of the knee and joint free bodies. Another cause is infection, of which synovial tuberculosis is common. Generally speaking, the synovial membrane is rich in blood vessels, has good blood circulation and is more resistant to bacteria, but in the case of infection with tuberculosis bacteria, the disease progresses more slowly and its symptoms are sometimes good and bad, this is one of the chronic synovitis of the knee joint. Synovitis causes Synovitis in the knee, in the elderly, is secondary to osteoarthritis of the knee, mainly due to mechanical biochemical irritation from cartilage degeneration and osteophytes, secondary to synovial edema, exudation and effusion of the knee joint. In young adults it is mostly due to acute trauma and chronic injury. Acute traumatic injuries include: knee sprains, meniscal injuries, lateral collateral or cruciate ligament injuries, intra-articular effusion or sometimes blood accumulation, manifesting as acute traumatic synovitis of the knee. Sometimes it can also be caused by simple knee synovial injury. If the trauma is mild, or if there is long-term chronic knee strain, which can cause gradual swelling and dysfunction of the knee joint, then chronic knee synovitis is formed. The swollen joint type is mainly swollen after excessive exercise, and the pain varies in severity. In the non-swollen type, joint pain predominates and is often accompanied by mild swelling. Studies have confirmed that both types are essentially the same, but differ only in the degree of synovial pathological changes. Researchers have found that after prolonged single-motion overload of the knee joint, the synovial tissue becomes congested and edematous, and the exudation of red and white blood cells and fibrin is positively correlated with the increase in intra-articular pressure and the decrease in oxygen partial pressure. The formation of inflammation, thus, it is believed that the occurrence of traumatic synovitis after excessive exercise is not only related to the repetitive_strike of the joint surface and injury to the joint capsule, but also plays an important role in the development and regression of the disease process. Synovitis treatment Among the many joints in the human body, the knee joint has the most complex structure, the largest intra-articular space, and the most abundant synovial tissue. In addition, the knee joint is almost the most frequently used joint in daily activities, so the chances of damage to the synovial membrane of the knee joint are the highest, which explains why synovitis is most often seen in the knee joint. This explains why synovitis is most often seen in the knee joint. When the body over-exercises or when the joint is sprained or traumatized, the synovial tissue becomes congested and edematous, and a large amount of fluid is secreted, resulting in joint effusion and increased pressure in the joint cavity, the patient may suddenly notice “thicker legs” or “swollen knees”. Due to the inflammatory factors in the joint fluid, the knee joint is often painful and swollen, and the patient is unable to bend or take steps. These are the signs of the acute phase of synovitis. In the eyes of experienced clinicians, synovitis is both common and curable. For many years, my secret to treating synovitis has been six words – rest, anti-inflammation, and decongestion. Damage to the synovial membrane is the starting point of the disease, so once synovitis is diagnosed, the first thing to do is to give the joint some rest to prevent the synovial membrane from being bruised again and the inflammation from worsening; synovial inflammation is the course of the disease, so anti-inflammatory medications should be used as early as possible and taken regularly to stop the synovial membrane from continuing to secrete inflammatory fluid to reduce the symptoms of pain and swelling. Joint swelling is a manifestation of the disease, so drugs that promote the absorption of joint fluid should be used, along with physical therapy to accelerate blood circulation around the joints and reduce swelling as early as possible. Early, standardized and reasonable drug treatment is the guideline for the treatment of synovitis. The natural course of synovitis is usually about 1-2 months. After regular treatment, the symptoms will be gradually relieved and the fluid will slowly disappear. Patients need to be patient, take their medications regularly and protect their joints in their daily life. If treatment is delayed, medication is inappropriate, or rest is inadequate, synovitis can last for months or longer, and long-term synovial inflammation can accelerate the aging of synovium and cartilage and increase the risk of infection in the joint cavity.