Anyone can get Osteoarthritis (“OA”) of the knee. Although it is most common in people older than 65, people in their 20s and 30s can develop it. The actual cause of OA is not known. However, many things can contribute to getting the condition.
For some people, genes or family history can affect their chances of developing the disease. For others, their OA knee pain might stem from being overweight, or injuries suffered during an accident. Sometimes, people with sports-related injuries or very active lifestyles can develop OA.
In a healthy knee, smooth cartilage covers and protects the ends of bones in the joint, allowing them to glide smoothly as you move. In a knee with OA, the cartilage that acts as a cushion between bones breaks down. The joint space narrows, which may cause bones to rub together. The thick, slippery fluid (synovial fluid) that lubricates and reduces friction in the knee becomes thin and less effective. When the knee is affected by OA, it may no longer function smoothly and can result in pain and stiffness.