Congenital tarsal coalition is a diagnosis that is often overlooked in
young patients who first present with foot and ankle pain. Tarsal coalition is
an abnormal fibrous, cartilaginous or osseous fusion of two or more tarsal
bones [1]. The prevailing etiologic theory for congenital coalitions is failure
of complete segmentation of mesenchyme with the absence of normal joint
formation. Approximately 50%?80% of cases of tarsal coalition are bilateral [2]
and more than 90% of coalitions are located between the calcaneus and the
navicular or between the talus and calcaneus [3]. Calcaneonavicular and
talocalcaneal coalitions have been reported to occur in approximately equal
frequency [4]. However, recent investigations suggest that calcaneonavicular
coaltions occur 3 times more frequently [5]. - See more at:
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