1) If you have flat feet and/or stand for long periods on a hard surface and/or participate in a repetitive motion activity such as walking or running 2) If you have pain in any or all areas: under the arch of the foot traveling under the inside of the ankle bone traveling up the shin or inner of the lower leg, you may have posterior tibialis dysfunction. TESTS: 1. come up on the toes of the injured leg/foot - if that hurts or you dont have the strength to do it - you may have PTT - see a ...