Knee squatting pain is mainly considered in the following areas: 1, patellofemoral chondritis, common in young patients, especially those who have a lot of sports squatting activities. This is because the long-term activity makes the patellofemoral articular cartilage surface wear significantly, and leads to partial detachment induced aseptic inflammation and pain. 2, knee meniscus injury, after the meniscus sprain, especially the posterior horn of the knee meniscus injury, in squatting activities when the posterior horn of the meniscus pull significantly, will lead to significantly increased pain. 3, knee osteoarthritis, common in middle-aged and elderly people, generally due to degenerative joint It is usually caused by wear and tear of the cartilage and osteophytes. It is common in young and middle-aged patients. 4. Synovial crepitus syndrome of the knee joint, due to the metaplasia of the knee joint, synovial hyperplasia is embedded in the patellofemoral joint, and the synovial membrane is squeezed and painful during squatting activities.