What one is the correct name? There is a lot of discussion going on as to what is the more suitable name. There are advantages for each name. A lot of it depends on the nature of the primary issue and whether it represents a primary concern of the posterior tibial tendon or is the driving factor. https://podiatry-portal.com/adult-acquired-flatfoot-or-posterior-tibial-tendon-dysfunction-or-progressive-collapsing-foot-deformity/