Knee cartilage injury may be caused by trauma, arthritis and other diseases. 1. Trauma: due to car accidents, falls and other traumatic factors leading to fractures around the knee joint, such as tibial plateau fracture, distal femur fracture, meniscus tear and so on, patients can have knee cartilage damage. 2. Arthritis: including primary osteoarthritis and secondary rheumatoid arthritis, rheumatoid arthritis and so on, these diseases will lead to inflammation of the knee joint, which will cause cartilage damage of the knee joint. 3. Other diseases: such as bone tuberculosis, bone tumors and other diseases, can also cause damage to the knee cartilage, damage. Knee cartilage damage may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.