Posterior Tibial Tendon Dysfunction (Adult Acquired Flatfoot): When Your Arch Betrays You

Your arch shouldn’t collapse as you age. Posterior tibial tendon dysfunction—also known as adult acquired flatfoot—is a progressive condition that starts with inner ankle pain and ends with rigid deformity if untreated. This guide breaks down who’s at risk, how to recognize it early, the science behind braces and orthotics, and the latest surgery options from tendon reinforcement to fusion.