Osteoarthritis, also known as osteoarthritis, proliferative arthritis, age-related arthritis, degenerative arthritis, and hypertrophic arthritis, is a chronic joint disease in which the main changes are degenerative disease of joint cartilage and secondary osteophytes. According to the pathogenic factors, it is divided into primary osteoarthropathy and secondary osteoarthropathy. If a normal joint gradually degenerates for no apparent reason, it is called primary osteoarthrosis; if the cartilage is destroyed or the joint structure is changed for some known reason, and later degeneration is caused by factors such as friction or pressure imbalance on the joint surface, it is called secondary osteoarthrosis. Clinical manifestations The main symptom is joint pain, which occurs during activity and disappears or gets better after rest. In acute attacks, the pain increases, and there may be joint swelling, joint stiffness, and intra-articular grinding sounds. In the early stage, there is no abnormality in joint shape and activity, but some patients feel joint pain when the joint is in a certain position for a long time or when they get up in the morning and go down to the ground, and the pain can disappear after gradually moving the joint for a certain period of time. Later, the pain may gradually worsen as the disease progresses. In late stage, bony thickening, joint swelling, muscle atrophy and joint deformation can be seen in joints with less surrounding soft tissues such as knees and fingers, and the joints have pressure pain, pain when moving, limited movement and a feeling of friction when moving.