Articular cartilage plays an important role in joint movement and it is very finely and scientifically structured to accommodate different functional needs. Understanding the structure of articular cartilage is important for understanding some of the problems in osteoarthritis pain. Articular cartilage is transparent cartilage with a smooth, light blue, shiny surface. It is a basic framework made up of a special type of collagen fibers called dense connective tissue, which is semi-annular in shape, resembling an arch-shaped goal, with its bottom end firmly attached to the bone below and its upper end facing the joint surface. This structure allows the articular cartilage to bind tightly to the bone and not fall off. Between these fibers are scattered chondrocytes, which are composed of flattened to elliptical or rounded cells from superficial to deeper layers, and which maintain the normal metabolism of articular cartilage. Articular cartilage is not innervated, and there are no blood vessels, its nutrients must be obtained from the joint fluid, and its metabolic wastes must also be discharged into the joint fluid, the nutritional metabolism of articular cartilage must be stimulated by joint movement, so joint movement plays an important role in maintaining the normal structure of articular cartilage Function: 1, to withstand the mechanical load of social activities in the life of a person The normal function of articular cartilage is indispensable. Articular cartilage can distribute the force evenly, so that the load-bearing surface is expanded. In this way, it can not only maximize the mechanical load, but also protect the articular cartilage from damage. 2, the role of lubrication articular cartilage is very smooth, joint movement is not easy to wear, and, flexible, free movement. Articular cartilage can maintain human – life activities without damage is because of good lubrication. When the synovial membrane is diseased, such as rheumatoid arthritis, the synovial fluid secretion is abnormal and the normal lubrication is lost, which affects the function of the joint and the nutrition of the articular cartilage. Before a person works to move the joints, so that the joints are fully lubricated, can increase the flexibility of the joints and prevent damage to the articular cartilage. 3, the absorption of force People engage in many strenuous activities during their lives without damage to the joints, one of the reasons is the strong absorption of articular cartilage. Articular cartilage is not only smooth, there is elasticity, to maximize the absorption, cushioning stress effect. Articular cartilage damage after the absorption of force is reduced, joint damage, degeneration will progressively aggravate