Lateral malleolus is extension of fibula beyond the ankle joint.
It can be fractured in direct trauma or twisting injuries of ankle.
It is usuallly accompanied by ligamentous injuries on the medial side or fracture of medial malleolus.
The xray shows an undisplaced fracture of lateral malleolus in 34 year old man which resulted following a twisting injury to the ankle.
One of the concerns in malleolar fractures is subluxation of the ankle joint which may result if the fracture is displaced.
An undisplaced fracture of lateral malleolus is very well treated by non operative methods.