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You have been given an artificial ankle joint.

At their lower ends the tibia and fibula form the malleolus bones in the ankle. At the top of the ankle the lower ends of the tibia and fibula are connected to a bone at the back of the foot.

The lower end of the tibia has a flat part. In the upper ankle this flat part transfers the main weight of the body to the bone at the back of the foot. The bone at the back of the foot is called the talus. When you move your upper ankle, the lower ends of the tibia and fibula slide over the talus. For this reason the joint’s surfaces are coated with cartilage.

You had an operation that involved replacing the joint surface of the flat part of your tibia and the joint surface of the upper part of your talus with synthetic material. It may also be that synthetic material was only used on your talus or only on your tibia. Metal can be used to replace the joint surfaces. A plastic component between the synthetic joint surfaces enables them to slide over one another.