pain and discomfort during daily activities, such as running, walking, kneeling, and bending.a possible deformity at the ends of the bones.some damage to cartilage and other tissue.Synovial fluid is present, and it helps reduce friction, supporting the movement of the knee. There may be some minor damage, but the bones are not rubbing or scraping against each other. A thin layer of bone will also develop beneath the cartilage in the joints. When the tissues harden, the bone becomes thicker and denser. ![]() The area where the bones and tissues meet will start to harden. Stage 2: MildĪt this stage, an X-ray will possibly show narrowing of the space in the joint, and bone spurs.Ī person may start to notice stiffness and joint pain, especially after resting for a while. Learn more about the early stages of OA of the knee here. The joint will appear healthy on an X-ray. Other changes in the joint at this stage can include slight damage to the cartilage, and narrowing of the space between the bones in the joint.Īt this stage, a person is unlikely to experience discomfort or pain. Stage 1: MinorĪn X-ray may not reveal any damage, but bony growths of bone called osteophytes can be an early sign of OA. The stages below follow the KL classification, based on a series of X-ray images of OA of the knee. The original KL classification was published in 1957. ![]() They commonly use the Kellgren-Lawrence (KL) classification of OA to describe OA of the knee, but there are other grading systems. ![]() Doctors often use stages to describe the progression. OA of the knee takes several years to develop. Share on Pinterest Gordon Schirmer/Getty Images
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