A malleolus is a projection of bone beyond ankle joint. The medial one is called medial malleolus. Other arising from tibia is called posterior. A counterpart called lateral malleolus is distal end of fibula
Medial Malleolus may get fractured in ankle injuries.
Tghe present xray shows a fractured medial malleolus in the lateral view. Anteroposterior view is of the same ankle and can be passed as normal thus emphasizing need for two views.