Most patients with rheumatoid knee osteoarthritis experience cold and pain in the knee, and the condition is further aggravated when they get cold, making them feel cold and painful, and affecting knee flexion and extension and weight-bearing activities. In addition, if the patient is in a damp or cold environment for a long time and the knee joint gets cold, it will affect the normal operation of qi and blood in the knee joint, which will result in local qi and blood stagnation, blood stasis and meridian obstruction, and the patient will also feel pain. You can take hot compress treatment, such as instructing the patient to take a hot bath, or local infrared therapy, low and medium frequency electrotherapy, microwave therapy, etc., which can accelerate the local blood circulation and promote the unblocking of blocked meridians, which can alleviate this phenomenon.