Which type of joint is most commonly affected by osteoarthritis?

The knee joint is the most commonly affected joint in osteoarthritis due to the significant weight-bearing function it serves and the mechanical stress it endures throughout life. Osteoarthritis involves the degeneration of joint cartilage and underlying bone, often resulting from wear and tear over time, which is particularly evident in the knee due to its role in movement and support of the body's weight.

The knee's structure, composed of bones, cartilage, ligaments, and synovial fluid, makes it susceptible to injury and gradual degradation. Factors such as age, obesity, joint injuries, and overuse can contribute to the development of osteoarthritis in this area. As the cartilage wears away, it can lead to pain, swelling, stiffness, and decreased mobility, which are hallmark symptoms of osteoarthritis.

In contrast, while wrist, elbow, and hip joints can also develop osteoarthritis, they are not as commonly impacted as the knee due to their different functional roles, stress levels, and potential for injury. The knee's unique combination of weight-bearing responsibility and movement makes it the joint most frequently associated with this degenerative condition.