The lack of synovial fluid in the knee can cause abnormal friction of the cartilage inside the joint when moving, resulting in significant pain and soreness in the knee joint. Therefore, in this case, the first thing to do is to avoid excessive stress and flexion and extension of the knee joint, and to avoid getting cold to avoid aggravating the symptoms of synovial fluid deficiency. You can apply hot compresses to the knee joint or apply blood-stasis-boosting drugs to promote blood circulation in the knee joint, thus promoting synovial fluid secretion and relieving the patient’s clinical symptoms. If necessary, a puncture of the joint cavity can be performed and sodium vitrate can be injected. Sodium vitrate is a nutritional lubricant that can help restore the clinical symptoms caused by the lack of synovial fluid in the knee joint.