Patients with knee pain from dancing commonly have the following causes: First, degenerative osteoarthritis: In the case of elderly patients, most of them have degenerative osteoarthritis of the knee. As they age, the knee cartilage will degenerate significantly, and the smoothness of the joint surface will decrease, so the wear and tear of the joint surface will increase, and dancing will further aggravate the wear and tear, resulting in knee pain symptoms, usually with knee stiffness and The MRI will reveal degeneration of the articular cartilage. Second, meniscal damage and synovial inflammation: In young patients, most of them have meniscal damage and synovial inflammation, which can lead to joint pain, limited movement, and even joint interlocking symptoms and joint effusion, and MRI will reveal meniscal damage and synovial inflammation. Early detection and early treatment can lead to significant relief of knee pain symptoms. Patients should usually pay attention to joint protection and can have regular injections of sodium vitrate to prevent serious damage to the knee joint and meniscus, which can protect the joint and prevent joint pain.