Knee pain can involve a variety of causes, common ones such as osteoarthritis, rheumatoid arthritis and acute injury to the knee joint, chronic strain, and also systemic metabolic diseases, as well as diseases of the high lumbar spine can all cause knee pain. For example, osteoarthritis of the knee joint can cause degeneration, deformation, and hyperplasia of the joint bone, which can also cause attack, wear and tear, and thinning of the joint cartilage, and ammonia can promote the repair of cartilage and help restore the function of cartilage. As long as the damage caused to the joint cartilage, oral ammonia has a certain therapeutic effect, but for different reasons should also be the cause of treatment, ammonia is only a means of symptomatic treatment.