Ointment is useful for knee pain and can be used as an adjunctive treatment, but when applying ointment, it depends on the cause of the knee pain. If it is osteoarthritis of the knee joint, chondromalacia patella, etc., the plaster can be applied, which can effectively accelerate blood circulation to activate blood, reduce swelling and relieve pain, but in the case of infection of the knee joint, that is, redness, swelling, heat and pain are more obvious, the plaster may lead to further aggravation of the infected lesion, which is not conducive to recovery. If there is pain in the knee joint, it should be treated according to the specific situation, not just applying creams. For example, if there is more fluid in the knee joint, syringe aspiration is needed to decompress the joint, and if the amount of fluid is relatively small, the knee joint should be kept relaxed and warm. Intra-articular injections, such as betamethasone injection and sodium vitrate injection, can be used to improve the inflammation in the joint and to lubricate the knee joint. If the osteoarthritis of the knee joint is serious, joint replacement of the knee joint may be needed to cure the problem, rather than simply applying creams for treatment.