There are several common causes of joint rattling: first, joint trajectory is not correct, mainly due to congenital factors, such as the patella tilted to the outside, resulting in the patellofemoral joint trajectory is not correct, the patient will show joint rattling, joint pain, and may even lead to joint activity restrictions, unable to participate in strenuous exercise. Second, degenerative osteoarthritis, especially in the weight-bearing joints of the lower extremities, during the process of activity due to severe wear of the cartilage of the joint surface, there will be a ringing sound, and there can be pain and limited movement, and in severe cases, joint deformation can also occur. Third, trauma can lead to articular cartilage damage, meniscal damage, and glenoid labral damage, all of which can affect joint movement and lead to ringing during joint movement, accompanied by severe pain, joint effusion, and limited joint movement.