Flatfeet are common—but when the arch of the foot begins to collapse and pain develops, everyday activities like walking, standing, or exercising can become difficult. In this episode, we explore acquired adult flatfoot deformity, also known as progressive collapsing foot deformity, a condition caused by stretching and dysfunction of the important posterior tibial tendon on the inside of the ankle.

Using easy-to-understand explanations, we discuss why some people with lifelong flatfeet suddenly develop pain later in life, what symptoms to watch for, and why the condition often worsens gradually over time. You’ll learn how the collapse of the arch changes the alignment of the foot, why pain may occur on both the inside and outside of the ankle, and how doctors diagnose the condition using physical examination and imaging studies. We  ...