Lateral knee cartilage bending pain may be caused by trauma, osteoarthritis, rheumatoid arthritis, rheumatoid arthritis and other diseases. 1. Trauma: due to the trauma caused by the knee cartilage, meniscus damage, the patient may appear knee cartilage lateral bending pain. 2. Osteoarthritis: due to the degeneration of the knee joint, the patient’s knee joint cartilage degeneration, sclerosis, hyperplasia and other changes, resulting in local unevenness, the patient may appear knee cartilage lateral bending pain. 3. Rheumatoid arthritis: due to infection and other factors caused by connective tissue diseases in the human body, when the knee joint is involved in the knee joint cartilage, synovial membrane and other tissues of the inflammation, the knee cartilage lateral bending pain can occur. 4. Rheumatoid arthritis: chronic inflammatory synovitis caused by heredity, infection, hormones and other reasons, patients can appear knee cartilage lateral bending pain. If the knee cartilage lateral bending pain is not relieved, or accompanied by other symptoms, you should go to the hospital in time, clear reasons for targeted treatment.