The foot is a complex structure consisting of 26 bones with multiple joints and ligaments between There are two longitudinal arches (medial and lateral) and one transverse arch. Three types of flat foot are identified flexible flat foot with good mobility of the subtalar joint , flexible flat foot with contracture of the Achilles tendon and finally rigid flat foot with restricted mobility of the subtalar joint which includes congenital vertical talus and tarsal coalitions There are pain stiffness , deformity of the tbot (valgus angulation of the hindfoot, abducted forefoot and supinated in relation to the hindfoot) and limitation of movement at the ankle and the, subtalar joints Flat foot may be associated with spasm of the. peronea! muscles. Conservative treatment including arch support, casting corticosteroid. Operative treatment including reduction of deformity with pin fixation in congenital; vertical talus excision of the coalition in tarsal coalitions syrvectomy and tendon transfer in tibialis posterior dysfunction. Finally, calcaneal osteotomy and arthrodesing operation may be done.