Which of the following is NOT a risk factor for osteoarthritis?

In the context of osteoarthritis, risk factors play a crucial role in the development and progression of the condition. Low physical activity is actually a modifiable risk factor; however, being inactive does not actively contribute to the onset of osteoarthritis in the same way obesity, muscle weakness, and family history do.

Obesity contributes to osteoarthritis primarily through increased mechanical loading on weight-bearing joints, which accelerates cartilage wear and tear. Muscle weakness can lead to joint instability, further contributing to the likelihood of joint damage. A family history of osteoarthritis indicates a genetic predisposition, suggesting that individuals with relatives who have the condition are at higher risk of developing it themselves.

In contrast, while low physical activity is not directly a risk factor for osteoarthritis, engaging in regular physical activity can help strengthen muscles around joints and maintain joint flexibility, potentially decreasing the likelihood of osteoarthritis development. Therefore, it is classified differently in the context of osteoarthritis risk factors.