A coalition is a congenital bridge or bar between adjacent bones. The classification of coalition is defined by both coalition location and type. Coalitions occur most commonly within the tarsal bones of the foot in 1 percent to 2 percent of the population, followed by coalition of the carpal bones and elbow. Ninety percent of tarsal coalitions involve the talocalcaneal and calcaneonavicular joints. Other foot coalitions can occur, but are rare. Coalitions are also classified based on the type of intervening tissue and include osseous, cartilaginous, or fibrous types.
7701 Las Colinas Blvd., Ste. 800, Irving, TX 75063