If the knee clicks when the leg is stretched, the patient may have osteoarthritis in the knee joint due to bone proliferation and degeneration, and the joint space is narrowed, which can cause clicks when the knee joint is moved due to cartilage friction. In this case, the patient can be instructed to take oral anti-osteogenic drugs, such as anti-osteogenic tablets and Golden Dragon Pills, which can slow down the aging and degeneration of the bones and relieve clinical symptoms. In addition, patients can be instructed to take oral calcium and vitamin D regularly, and oral chondroitin hydrochloride, which can play a role in nourishing cartilage. In addition, the elderly can be instructed to eat more calcium-rich foods, such as shellfish, dairy products, soy products, etc., which can effectively prevent the loss of calcium in the bones and can also play a role in relieving clinical symptoms.