The correct answer is option C, which states that the ankle joint is a hinge joint.




A hinge joint is a type of synovial joint that allows movement in only one direction, similar to the hinge of a door. It is formed by the articulation of two bones, where one bone has a convex surface that fits into the concave surface of the other bone. This type of joint allows flexion and extension movements.


The ankle joint is formed by the articulation of three bones: the tibia, fibula, and talus. The tibia and fibula are the two bones of the lower leg, while the talus is one of the bones of the foot. The ankle joint is responsible for the movement of the foot, allowing dorsiflexion (flexing the foot upward) and plantarflexion (pointing the foot downward).


The ankle joint is a hinge joint because of its structure. The tibia and fibula form a mortise, which is a groove-like structure, and the talus fits into this mortise. The talus has convex surfaces that fit into the concave surfaces of the tibia and fibula, forming a hinge-like movement. This hinge joint structure allows the ankle joint to primarily move in one direction, which is up and down.


The ankle joint allows two main movements:
1. Dorsiflexion: This movement involves flexing the foot upward, bringing the toes closer to the shin. It is the movement required to walk on the heels.
2. Plantarflexion: This movement involves pointing the foot downward, away from the shin. It is the movement required to stand on tiptoes or push off while walking or running.


In conclusion, the ankle joint is classified as a hinge joint. It allows movements of dorsiflexion and plantarflexion, which are essential for various activities such as walking, running, and jumping.