Patients with rattling knee joints can be treated through joint therapy, minimally invasive arthroscopic surgery, etc. according to the cause, as follows: First, joint therapy: If the joint is gross due to osteoarthritis of the knee joint, resulting in joint rattling, intra-articular injection of sodium vitreous acid can be given once a week for a course of five consecutive injections, which can lubricate the joint cartilage, protect the joint cartilage and reduce joint rattling. In addition, serious cases can also consider arthroscopic minimally invasive surgery to smooth out the rough joint surface, reduce joint wear and tear, and remove the joint rattle, and those with joint deformity need to consider artificial joint replacement surgery to replace the joint surface and remove the rattle. Second, minimally invasive arthroscopic surgery: If the joint rattling is caused by intra-articular free body or meniscus injury, minimally invasive arthroscopic surgery should be used to remove the free body and suture the meniscus to restore joint function and remove the rattling in the knee joint. Postoperatively, muscle exercises should be used to enhance the stability of the knee joint.