What is the protrusion located on the side of the ankle called?

The correct answer is the malleolus, which refers to the bony prominence on the sides of the ankle. Specifically, there are two malleoli: the medial malleolus on the inner side of the ankle, formed by the tibia, and the lateral malleolus on the outer side, formed by the fibula. These structures are essential for the stability of the ankle joint and play a critical role in forming the anatomical framework of the ankle.

The capsule refers to the protective covering around joints, while cartilage is the flexible connective tissue that cushions and reduces friction between the bones in joints. Both of these structures support joint function but do not specifically address the protrusion of the ankle. The fibula is one of the two bones in the lower leg, the other being the tibia, and while it contributes to the lateral malleolus, it is not the term for the protrusion itself. Understanding the malleolus' role is vital for recognizing its importance in diagnosing and treating ankle injuries, as well as knowing its relevance to the overall movement and stability of the ankle joint.