synostosis

Synostosis (plural: synostoses) is fusion of two bones. It can be normal in puberty, fusion of the epiphyseal plate to become the epiphyseal line, or abnormal. When synostosis is abnormal it is a type of dysostosis.

Examples of synostoses include:

craniosynostosis – an abnormal fusion of two or more cranial bones;

radioulnar synostosis – the abnormal fusion of the radius and ulna bones of the forearm;

tarsal coalition – a failure to separately form all seven bones of the tarsus (the hind part of ...