Studies have made it possible to specify that the one previously treated by a single or two fiber complexes outside the joint capsule of the lateral ankle area; Now they are two independent fascicles: a superior that is placed inside the joint and lower capsule that work together in the lateral ligament of the calcaneus-fibular. In addition, it has been possible to specify, that the upper part being an intracapsular structure, will not be able to heal if it becomes an injury, therefore, it could be a great indication of those injuries and pains that end up becoming chronic (between 30-40%) among patients.