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Zone 1 flexor hallucis longus (FHL) tendoscopy of the right foot. The patient is in the prone position. (A) A Wissinger rod is inserted through the posteromedial portal into the orifice (a) of the zone 2 FHL tendon sheath under arthroscopic guidance. (B) The rod passes through the zone 2 FHL tendon sheath under the sustentaculum tali and penetrates the plantar aponeurosis distal to the navicular bone. The plantar portal incision is made at this point.
