The most common synostosis is that between the radius and the ulna proximally in the forearm, near the elbow (Fig. 13-10), but these two bones also may be joined at any point in their paired course in the forearm.

What's a synostosis?

Medical Definition of synostosis

: union of two or more separate bones to form a single bone also : the union so formed (as at an epiphyseal line) Other Words from synostosis. synostotic \ -​ˈtät-​ik \ adjective.

What happens if craniosynostosis is left untreated?

Left untreated, craniosynostosis can result in further cranial deformity and potentially an overall restriction in head growth, with secondary increased intracranial pressure. It can also lead to psychosocial issues as the child interacts with peers during development.