Which one is the correct name? There is a lot of debate going on as to what is the more appropriate name. There are advantages for each name. A lot of it depends on what the primary issue and if it is a primary problem of the posterior tibial tendon or is the main cause. https://podiatry-portal.com/adult-acquired-flatfoot-or-posterior-tibial-tendon-dysfunction-or-progressive-collapsing-foot-deformity/