Fracture A fracture is most often caused by trauma, such as falls, motor vehicle accidents, and sports-related contact. It is also important to begin strengthening and stretching exercises hours after minor injuries, or as advised by a doctor. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy. There are usually four in each knee, at the embryonic stage, and help to bend the joints easily. “Diagram Of Knee”