Nowadays, more and more patients with osteoarthritis of the knee joint come to our department to receive surface replacement of the knee artificial joint. With the increasing age, most elderly people have knee pain, and many people often make the self-diagnosis of “rheumatism or rheumatoid rheumatism”, and apply creams, or do acupuncture and physical therapy, or take the so-called “medicinal wine”, but after a lot of torment, the real effective ones are very few. The reason for this is that the cause of the disease is wrong. In fact, the most common cause of bone and joint pain in the elderly is osteoarthritis. The pathology of osteoarthritis is based on the wear and tear of joint cartilage, and increased exercise will only aggravate cartilage damage. Even after receiving a knee arthroplasty, if weight control is not taken seriously, the life span of the joint will be greatly reduced, and at the same time, the chance of diabetes increases greatly in this age group.