Frequent dance is harmful to the knee, mainly manifested in three aspects: 1, in the dance, due to the knee joint is often in flexion and extension activities, patellofemoral joint friction is relatively large, may lead to cartilage degeneration, long time easy to appear osteophytes and calcification, as well as the narrowing of the joint space, easy to lead to pain and activity is not conducive to, especially for menopausal women, more likely to lead to osteoporosis, as well as proliferation and degeneration. Therefore, menopausal women must pay special attention to it.2. During activities, the knee joint will be twisted in a semi-flexed position, which may lead to meniscus damage, and once damaged, knee pain will easily occur when they are tired and cold, and there may be weakness and interlocking of joints.3. If you dance outdoors, it is very easy to get cold, and once cold, it will lead to pain and unfavorable activities. Once cold, it will lead to muscle and ligament and other soft tissues become tense, blood circulation will also decline, metabolic products increase, accumulation, will lead to knee joint symptoms more obvious.