The condition is called osteoarthritis. It is very common in older people, especially older women. Osteoarthritis is a common chronic degenerative osteoarthropathy, which is a chronic aging of the joints. Osteoarthritis of the knee is one of the most prevalent forms of osteoarthritis, also known as osteoarthrosis, degenerative arthritis, and senile arthritis. The underlying cause of osteoarthritis is the metamorphosis and exfoliation of articular cartilage. On the contact surface of two bones, there is a layer of cartilage that protects the joint. Joint cartilage becomes more damaged, degenerated and worn out with age for various reasons. The human body this machine after decades of operation, part of the cartilage in the joints worn out, cartilage and bone is different, cartilage once worn out is very difficult to regenerate, without the protection of cartilage, walking bone grinding bone, bone on the outermost periosteum and synovial membrane around the nerve-rich, so it is very painful. In the long run, the knee joint will be deformed and become O-shaped leg or X-shaped leg. Early conservative treatment 1, maintain optimism and positive emotions, avoid falling into a state of depression; 2, reduce repeated squatting, climbing stairs, walking long distances, lifting heavy objects, climbing mountains and other sports. Appropriate sports and muscle exercises can be carried out to increase the stability of the joints: for example, lying flat on the bed and practicing lifting the legs, insisting on 10-15 seconds before putting them down, and alternating between the two legs. The increase in muscle strength can cushion the external impulse and reduce the possible damage. Medications 1. Non-steroidal anti-inflammatory painkillers: e.g. Cilastatin, Anklesin, Meloxicam, etc.; 2. Cartilage protectants: Aminoglucose Hydrochloride (Sulfate), Chondroitin Sulfate; 3. Topical medications: creams, Futenugreek emulsion, etc.; 4. Intra-articular injections: Sodium hyaluronate or medical chitosan intra-articular injections once a week for a total of 4-5 times. If osteoarthritis reaches the advanced stage, the cartilage wear is very serious, for the above methods are ineffective, the patient still complains of obvious knee pain, activity limitation, joint space narrowing, or serious knee deformity and other conditions, then only the artificial knee replacement method to completely treat osteoarthritis of the knee joint, so as to improve the patient’s quality of life. Knee joint replacement is not to remove all the bones, but only to cover the non-smooth surface of the joint with a layer of smooth artificial joint surface, just like decorating a wall with a layer of wallpaper, or applying a layer of foundation for make-up. The purpose of knee replacement is to relieve pain, restore function and improve quality of life. After knee replacement surgery, the patient is completely relieved of osteoarthritis, joint mobility returns to normal, pain is eliminated, no longer need to take oral medication, and is fully restored to a normal person’s activity level and life, traveling and enjoying his or her old age. What happens if I don’t have surgery? Osteoarthritis of the knee is not a fatal disease in itself, and at most, it causes pain, disability, and inability to walk. However, long-term pain and limited activities will lead to and aggravate a series of serious diseases, such as: depression, osteoporosis, coronary heart disease, diabetes, hypertension, cerebrovascular accidents and so on. And these diseases will not only greatly shorten the patient’s life expectancy, but also have no quality of life to speak of.