Biomechanics
PTT lies in an axis posterior to the tibiotalar joint and medial to the axis of the subtalar joint
functions as a primary dynamic support for the arch
acts as a hindfoot invertor
adducts and supinates the forefoot during stance phase of gait
acts as secondary plantar flexor of the ankle
major antagonist to PTT is peroneus brevis
activation of PTT allows locking of the transverse tarsal joints creating a rigid lever arm for the toe-off phase of gait