An ankle splint has a pronation belt (11) with a sole section (17) and a lateral/instep section (18) an air cushion (12) designed as a continuous massaging cushion being provided in these sections of the pronation belt (11). The air cushion (12) is designed so that the fluid contained in the air cushion (12) is pumped dynamically out of the sole section (17) into the lateral/instep section (18) and vice versa.