In clinical practice, when a patient experiences pain in the leg socket, it is actually pain in the popliteal fossa of the knee, which can be caused by a number of factors. Most of them are caused by excessive exertion, strain, cold or trauma to the knee joint, resulting in damage to the popliteal area of the knee joint and causing pain. Osteoarthritis and meniscus injuries can also cause popliteal pain. If a patient has a popliteal cyst, the cyst will compress the tibial nerve and tibial artery, and the nerve will irritate the surrounding muscles, which will also cause pain. If the patient suffers from lumbar disc herniation, the herniated nucleus pulposus compresses the dural sac and stimulates the nerve root, which will also cause knee pain. In the clinic after the appearance of this phenomenon should go to the hospital, after the doctor clearly determine the cause of the disease, and then according to the specific cause of the disease to take symptomatic treatment.