A tarsal coalition is an abnormal fusion of fibrous (syn– desmosis), cartilaginous (synchondrosis), or osseous (synostosis) tissues between the tarsal bones in the hind and midfoot. This union can be either congenital or acquired. The most commonly reported tarsal coalition are the calcaneonavicular and talocalcaneal. Other coalitions including the talonavicular, calcaneocuboid, and cubonavicular have also been reported, but with much lower frequency. In addition, there have been few cases of a naviculocuneiform coalition between the navicular and one or more of the cuneiform bones.