Which type of bones are classified as round bones like the knee?

Sesamoid bones are classified as round bones that develop within tendons, and they have unique functions in the body. The knee contains the patella, which is the largest sesamoid bone. These bones help to reduce friction and improve the leverage of muscles around joints, allowing for more effective movement. They are typically found in areas where tendons pass over joints, providing mechanical advantages during movement. This classification is distinct from long bones, which are primarily responsible for support and mobility, short bones, which provide stability and some movement, and flat bones, which serve protective roles and are involved in muscle attachment. The unique properties of sesamoid bones, particularly their round shape and functional role in enhancing joint movement, make them the correct answer in this context.