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Related to tarsal coalition: calcaneonavicular coalition
the fusion of parts that are normally separate.
tarsal coalition the fibrous, cartilaginous, or bony fusion of two or more of the tarsal bones, often resulting in talipes planovalgus, although other deformities occur and some patients are asymptomatic; it may be congenital or acquired as a response to trauma, infection, or joint disease. Called also tarsal bar.