Swollen knees can occur when there is an increase in fluid around the knee joint. This increase in excess fluid can be caused by a variety of factors, including untreated injuries or severe collisions in the knee. Swollen knee conditions can affect anyone regardless of age, but most at risk are elderly people. Not only that, people who are overweight or obese are also at risk of experiencing this condition. Understanding the Causes of Swollen Knee One cause of knee swelling is injury that causes sprains or sprains. When the knee ligaments are dislocated, there will be pain and swelling in the knee. Aside from being sprained, the knee can swell also can be caused by several diseases and certain conditions, such as: Osteoarthritis Osteoarthritis is the most common type of arthritis. This condition can cause pain and swelling in the joint area, as well as cartilage damage. If the knee cartilage is damaged, the leg bones will rub against each other to cause swelling and impaired mo...