Coalition

Last revised by Dr Tom Foster on 30 May 2020

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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Cases and figures

  • Case 1: calcaneonavicular coalition
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  • Case 2: luno-triquetral coalition
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