Untreated chondromalacia patella on the left side can lead to fluid buildup and swelling in the knee joint, which gradually progresses to chondromalacia patellae degeneration and patellofemoral arthritis, resulting in limited mobility. Chondromalacia patella refers to the softening and rupture of the patellar cartilage and the development of effusion around the patella, leading to joint swelling. The destruction of the patellar cartilage causes a feeling of friction in the patella when flexing and extending the knee, leading to pain. Painful movement and swelling of the knee joint cause limitation of flexion and extension of the knee joint. In the late stage of development, the patellar cartilage continues to wear and tear, localized osteophytes, chondromalacia degeneration of the patella, patellofemoral arthritis, and the pain in the knee joint is obviously aggravated, and it is not possible to go up and down the stairs normally, which affects the patient’s daily life. Left patellar chondromalacia is recommended to actively consult the doctor and standardize the treatment under the guidance of the physician.