The knee joint, consisting of the medial and lateral femoral condyles, the medial and lateral tibial condyles, and the patella, is the largest and most complex joint in the body and has a high chance of injury. It is an important part of the body, but the knee has the most synovial membranes on the body, and the knee is highly athletic and heavily loaded. A common symptom is fluid in the knee, which can lead to joint congestion, swelling, pain, increased oozing, joint effusion, difficulty moving and squatting, and limited function. So where does the “water” in the knee come from? First, we need to understand the synovial fluid of the knee joint to make up for it. Knee synovial fluid is a yellowish, slightly viscous fluid that lubricates cartilage when the joint is moving to reduce wear and tear, synovial membrane damage or joint damage, because the hyaluronic acid content and polymerization decrease, the viscosity of the synovial membrane decreases, and cartilage is easily damaged. Therefore, in osteoarthritis, doctors often choose to inject sodium hyaluronate into the joint cavity, which means that the knee joint is “oiled” manually. In a normal knee joint, a small amount of joint fluid is produced, about 5-10 ml, which is important for the normal maintenance of the joint and is equivalent to the grease in the bearings, which has a strong lubricating effect. When the synovial tissue in the joint is damaged or irritated, the normal absorption and secretion functions of the synovial surface are impaired, resulting in the production of fluid that cannot be absorbed in time, thus forming joint effusion. Some people want to use a syringe to extract the joint effusion, but simply using a syringe to extract the fluid cannot solve the problem, the fluid extraction only plays a temporary role, treating the symptoms but not the root cause, because the soft tissues are not repaired and healed, the fluid will slowly seep out, and only when the soft tissues are completely repaired will the fluid be eliminated.
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