[Lateral malleolar fractures : when to operate ?].

Ankle fractures account for 10 % of all fractures in adults. The incidence of ankle fractures is rising, particularly as the population ages. Two thirds are isolated malleolar fractures. The most used classifications are anatomical, Weber's and Lauge-Hansen's classifications. The treatment of lateral malleolar fractures may be conservative or surgical, depending on the ankle stability. To test this, a weight-bearing X-ray is required. If this is not possible on the day of trauma, it can be done 7 days later. Conservative treatment consists of a six-week immobilization in a splint or plaster cast, with weight-bearing as tolerated. Surgical treatment is mandatory for unstable fractures.