Functional exercise is the most basic and important aspect of treatment for people with osteoarthritis, and it is also the most overlooked. Joints are like door shafts, the more they move, the less they “rust”. Physiologically, human joints rely on articular cartilage to transmit pressure and to withstand joint movement. Articular cartilage is not directly supplied with blood, but absorbs nutrients by exchanging substances with the joint fluid in the joint cavity. Under normal conditions, there is a small amount of synovial fluid in the joint cavity and the cartilage has a certain degree of flexibility. When the joint is under pressure and joint movement, the synovial fluid flows back and forth in the joint cavity, and due to the different pressure, the cartilage is flattened or bounced like a sponge, continuously absorbing nutrients from the joint fluid to maintain the normal metabolism of the cartilage. In addition, the movement of the joint is also a grinding remodeling of the diseased area. Through functional training, it can significantly increase the stability of the joint and reduce joint sprains, etc. In general, functional training should include the following two aspects: First, muscle strength training: mainly to exercise the strength of the muscles. For example, supine, the foot hooked upward, leg taut, muscle eschew, repeated training, so that you can exercise the thighs, calves in front of the muscles; supine legs bent knees and hips and forcefully clamping the pillow placed between the thighs, repeated training, so that you can exercise the muscles of the inner thighs; supine double lower extremities together straight lift, to the limit and hold on for a few seconds, and then put down the rest for a few seconds, repeatedly practice, daily exercise The number of times can be less to more, step by step, so that the muscle strength of the legs; hands on the wall to stand, both feet and shoulder width, heel up, toe paws, repeated exercises, which can strengthen the muscle strength of the back of the calf. Second, joint activity training: mainly to flexion and extension of joints under no weight. All the so-called good functional training methods are still the most important in the persistence, if you can adhere to the training daily, then will certainly be beneficial to the prevention and treatment of osteoarthritis.