Posterior tibial tendonitis is an overuse injury of the tendon around the inside of the ankle joint. It is more common in feet that pronate excessive with higher forces and in those who are active. In both types of cases, the forces make the muscle work harder and stress going through the tendon is greater. This makes it prone to an overuse injury. Thor this condition is to use interventions such as foot orthotics and gait retraining to decrease the load in the tendon.