Posterior Tibialis Tendon Dysfunction (PTTD)
A Common but Overlooked Cause of Adult Flatfoot & Inner Ankle Pain
If you’re experiencing pain and swelling on the inside of your ankle, especially when walking or standing, and you’ve noticed your foot arch starting to collapse — you might be dealing with Posterior Tibialis Tendon Dysfunction (PTTD).
Also known as Adult Acquired Flatfoot, this condition can worsen over time if left untreated. The good news is: with early diagnosis and podiatry-led treatment, we can help you reduce pain, prevent progression, and restore function.
What is Posterior Tibialis Tendon Dysfunction?
The posterior tibialis tendon runs along the inside of your ankle and helps support your foot’s arch. It plays a critical role in stabilising the foot and allowing you to walk efficiently.
PTTD occurs when this tendon becomes inflamed, overstretched or torn, leading to a gradual flattening of the arch and rolling in of the ankle (overpronation). It’s most common in adults over 40, especially women and those with an active or weight-bearing lifestyle.
