Knee joint ringing with pain can be caused by the following reasons: first, patellofemoral osteoarthritis, patellofemoral osteoarthritis patients can have patellofemoral joint cartilage damage, when the patella and femoral cartilage rub against each other can have a ringing sound, and can be accompanied by friction pain, then early examination of the patellofemoral joint X-ray, CT, MRI to diagnose and early treatment. Second, osteoarthritis of the knee joint, osteoarthritis of the knee joint can lead to damage to the meniscus cartilage, which can have a popping sound at the joint and joint pain, then we should check the X-ray and CT of the knee joint for diagnosis and treatment. Third, meniscal damage, when the meniscus of the knee is torn, there can be meniscal ringing, accompanied by pain in the knee joint, especially when the knee joint is flexed and straightened, the pain is more obvious, then the MRI of the meniscus should be examined for early diagnosis and early treatment.