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Anatomic location of impingement in retrotalar tunnel. An anatomic sample of the right foot in the prone position is shown from a sagittal view. (A) Posterior view of flexor hallucis longus (FHL) muscle and tendon with pulley. (B) Posterior view of FHL muscle and tendon without pulley. (1, FHL tendon; 2, calcaneus.) (C) Retrotalar tunnel with pulley visualized from below (FHL tendon removed). (1, posterior medial tubercle; 2, retrotalar pulley; 3, posterior lateral tubercle.)
