What is Tibialis Posterior Tendinopathy?

The tibialis posterior muscle passes down the back of the leg and under the medial malleolus or bony bit on the inside of the ankle. It inserts on the lower inner surfaces of the navicular and cuniform bones in the midfoot and the base of the 2nd, 3rd, 4th and fifth long metatarsal bones under the foot.

Understanding Tibialis Posterior Tendinopathy

It is used to plantarflex the foot as in going up on your toes, and invert the foot which is turning the soles of the feet inwards.

Tibialis posterior tendonitis is an overuse injury and is thought to be due more often to degeneration of the tendon rather than acute inflammation. There may be a partial avulsion where the tendon pulls away from the bone at the attachment to the navicular bone.

Long term injuries to the tibialis posterior can result in insufficiency of the muscle and a condition called tibialis posterior dysfunction which results in fallen arches, or flat feet.