Posterior Tibial Tendonitis is starting to be seen more often as a problem due to the trend to barefoot and minimalist running techniques. Posterior Tibial Tendonitis happens as running on the forefoot increases the load on the posterior tibial muscle. Those with a medially located subtalar joint axis are at greater risk for Posterior Tibial Tendonitis as the muscle has to work even harder due to the short lever arm. The treatment of Posterior Tibial Tendonitis is to decrease the load in the muscle by the use of foot support that inverts the foot, so the posterior tibial muscle does not have to work so hard to do its job. There are other treatments that can be applies for posterior tibial tendonitis to help the tissues get better.