What one is the correct name? There is a lot of discussion going on as to which is the more appropriate name. There are merits for each name. A lot of it depends on what the primary pathology and whether it represents a primary problem 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/