Patellofemoral chondromalacia is an injury to the cartilage of the patellofemoral joint. It is a common and frequent disease, which used to be seen mostly in middle-aged and elderly people. In recent years, with the popularity of sports and fitness, the incidence is increasing among young people. The main symptom is knee pain, mainly pain when force is applied, pain when jumping, pain when going up and down stairs, difficulty squatting, often feeling weak, playing soft, joint activity can have a ringing, frictional feeling. Continued development may result in pain when walking on flat surfaces and joint swelling. There may be no abnormalities or mild degeneration on radiographs. Treatment may include topical medications, ultrashort wave physical therapy, oral glucagon, Vigorix, etc. At the same time, quadriceps strength training (static squatting exercises) should be performed. With treatment, the symptoms usually disappear. The symptoms are often caused by strenuous exercise, such as mountain climbing, stair climbing, dancing, taijiquan, repeated squatting exercises, etc. Therefore, if you have symptoms, you should avoid the above exercises. If the symptoms persist, a hospital visit should be made to take an axial patella film to see if the patella is tilted, and if it is tilted, surgery can be considered.