Limited cartilage injury of the medial femoral condyle of the left knee may be caused by violent factors, disease factors, and factors of its own degeneration. 1. Violent factors: after the patient suffers from trauma, there may be limited cartilage injury of the medial femoral condyle of the left knee, which mainly manifests as pain in the joint area and a certain degree of activity limitation. If the violence factor is large, also see will cause fracture, also will form cartilage damage. 2. Disease factors: some patients have limited cartilage injury of the medial femoral condyle of the left knee, which may also be caused by rheumatoid arthritis, rheumatoid arthritis and other diseases secondary to the stimulation of inflammation on the cartilage damage. 3. Self-degeneration factors: with age, the joints will also undergo degeneration, there will be cartilage degeneration, resulting in limited cartilage damage of the medial femoral condyle of the left knee. It is recommended that patients with related symptoms seek medical examination and treatment in a timely manner, so as to avoid aggravation of the symptoms and the impact on the activities of the aggravation.