Definition: The Posterior Tibialis Tendon is an important structure that works to hold up the arch of the foot. It runs behind the ankle bone on the inside of your ankle (medial malleolus), across the instep and attaches to the inside of the midfoot Sometimes this tendon can become overstretched or inflammed. This can lead to an aquired flat foot. There are several names for this type of condition such as, tibialis posterior tendon dysfunction, adult acquired flatfoot deformity and tibialis posterior insufficiency.
Function: Posterior Tibial Tendon Dysfunction (PTTD) can be caused by a dysfunction or partial/complete tear of the posterior tibialis muscle/tendon.