Dr Tom Foster and Dr Daniel J Bell et al.

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


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.

Terms used in radiology

Article information

rID: 74345
Section: Anatomy
Tag: cases
Synonyms or Alternate Spellings:
  • Joint coalitions
  • Joint coalition
  • Coalitions

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Cases and figures

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