Stage zero is considered pre-osteoarthritis (pre-OA) and describes a normal, healthy joint before the disease manifests. However, this stage can also describe an early stage … See more

Stage one of OA is considered early or doubtful. You may begin to lose some of the cartilage between your joints. However, the space between your joints wouldn't be getting sma… See more

During stage two of OA, bone spurs grow and become painful. The space between joints may begin to narrow a little. Enzymes can begin to break down the cartilage. See more

Stage three of OA is considered moderate, and the cartilage between the bones begins to show signs of wear. The space between joints becomes visibly narrower. More bone spurs may … See more