compromise of tibialis posterior (PTM) function

compromise of tibialis posterior (PTM) function

development of an initially mobile but progressively more rigid painful flat foot deformity, and inability to perform a single-leg raise on affected side, due to tibialis posterior dysfunction, with loss of hindfoot inversion and medial longitudinal arch height, with unopposed action of peroneus brevis; characterized by: foot abduction and eversion and increasing pes planus; loss of integrity and function of the deltoid ligament, talonavicular capsule and spring ligament; progressive medial subluxation (due to plantarflexion and adduction of the talus), calcaneal valgus and transverse-plane rotation of Achilles tendon pull
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