Chondromalacia patellae is also known as chondromalacia patellae, or chondromalacia patellae. It is mostly seen in young and strong men, especially in sports athletes, such as track and field, volleyball and mountain climbers. Frequent long-distance cycling also predisposes to this disease. Apparently, this disease is related to chronic injury (strain). When the knee joint is in a semi-flexed position, the patella is in closest contact with the intercondylar concavity of the femur, and in this case excessive force is exerted, the cartilage of the patellofemoral joint surface is subjected to excessive wear and tear, and damage to the patellar cartilage occurs over time. Occasionally the patella is bruised, which may become the cause of this disease. The pain in the knee is sharp and painful at the beginning of the disease, and it is aggravated by exertion, running, bouncing, and going up steps, etc. The pain is light or disappears at rest, but it is persistent over time and obviously affects functional activities. Due to the reduction of activity, muscle atrophy of the affected limb can be produced, especially quadriceps atrophy is more obvious. It can produce joint swelling and fluid accumulation. Treatment: 1. Local rest, especially in the early stage, adequate rest is the fundamental treatment measure. Therefore, according to the different work and occupation, the exercise mode can be adjusted appropriately. I should pay attention to the protection, as little as possible to carry out the knee semi-flexion movement. 2. External scalding with Chinese medicine. If there is joint effusion and the pain is heavy, you can take Chinese medicine internally. 3.If the pain is mainly or the pain point is more limited, you can do local closure, local injection treatment of Chinese medicine, or joint cavity injection treatment in the joint injection prednisolone 25 to 50 mg, once a week. 4. Intra-articular injection of lubricant. Hyaluronate can also be injected into the joint cavity once a week, 5 times a course. With joint effusion can take Chinese herbal medicine synovitis punch; middle and late stage can take strong bone and joint pill, osteophyte pill, etc. 5.Acupuncture, physiotherapy, plasters and other treatments. 6, usually pay attention to keep warm, avoid strenuous exercise, less walking, long time squatting, etc.. Wear knee pads if necessary. 7. If conservative treatment is ineffective and the symptoms are worsening, surgery should be considered. Normally, excessive squeezing and rubbing of the patellar surface should be avoided. For those who are over 50 years old and obese, repeated exercises in the semi-flexed position of the knee should be avoided. Insist on non-weight-bearing knee flexion and extension and quadriceps exercises.