A coalition is a joining of two bones that are normally discrete 1. It is usually a congenital abnormality. The bridge between the bones is initially fibrous, then gradually becomes cartilaginous, finally ossifying. Symptoms tend to arise as the coalition forms a synostosis, which is usually from 8 to 16 years of age 2,3.
Types
Many rarer coalitions have been reported in the literature.
History and etymology
Coalition is derived from the Latin word 'coalescere' which means to grow together 1.
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