The specific treatment of knee patellar cartilage damage is as follows: 1, trauma-induced cartilage damage to the patellofemoral articular surface, such as damage to a larger area, more than 1.5 square centimeters, it is necessary to perform open surgery or arthroscopic surgical treatment, the cartilage shed to the joint cavity and cartilage with bone tissue, back to the defective area, so that the cartilage regrowth, to avoid early osteoarthritis caused by cartilage defects, which is trauma 2, the patellofemoral joint long-term chronic wear and tear, resulting in cartilage damage, common in middle-aged and elderly patients squatting for a long time, climbing stairs is particularly common in women. In addition, some patients often suffer from congenital malalignment of the patellofemoral joint, or trauma resulting in patellar tilting, prematurely causing damage to patellar cartilage, for such patients need to assess the extent of patellar cartilage damage, as well as the specific causes of patellar cartilage damage, if necessary, can be performed under the arthroscope lateral support band release, patellar medial support band reconstruction, as well as tibial tuberosity internal displacement, a series of adjustment of the patellar For severe patellofemoral osteoarthritis, especially in elderly patients, patellofemoral joint replacement can be considered.