The autumn breeze, with “old cold leg” should be more careful. The “old cold leg” is a common name for osteoarthritis of the knee joint, which is characterized by coldness, soreness, numbness, pain and inconvenience in the lower limbs and joints, often recurring or aggravated by wind and cold in autumn and winter, and ineffective for years of treatment. The occurrence of osteoarthritis of the knee joint is closely related to climate change. Therefore, the elderly should pay special attention in autumn. Old people with cold legs should pay attention to keeping warm, wear thicker clothes and socks. Soak your feet in hot water and apply hot compresses to the knee joints frequently. It is better not to use knee pads to keep the knee warm because they are very elastic and affect the blood circulation around the knee, making it more difficult for the knee to move. You should also pay attention to knee health care and do reasonable physical exercise, such as tai chi, jogging, and various gymnastics. Older people should get more sunlight, pay attention to cold and dampness, and keep warm so that the knee joint can rest. After the pain is relieved, walk slowly on flat ground once or twice a day for 20 to 30 minutes each time. Try to reduce weight-bearing exercises for the knee joint such as going up and down steps and running to avoid and reduce the wear and tear on the joint cartilage, and when you have to go up and down steps, it is better to hold the stairs or a cane. Elderly people who like to exercise should not stay in one position for a long time, and should not do exercises such as repeatedly flexing and extending the knee joint, rubbing and pressing the patella, or shaking the knee joint blindly. Specific exercises for the elderly are: sitting or supine, straighten the knee, tense the thigh muscles, dorsiflexion of the foot to the head, and tense the calf muscles, insist on three or four seconds each time, do 10 times per minute, and do three or four minutes in a row. You can do it three or four times a day.