When the fragments of a broken bone heal and join together, they unite. Union may be promoted, or helped, by reducing the fracture - replacing the fragments in their anatomical position if they are displaced. After reduction, excessive movement of the broken bone is prevented by fixation- cither external, for examplc a splint or plaster of Paris cast, or internal, for example a pin or a plate and screws.

A displaced fracture which is not reduced may result in malunion - incomplete or incorrect union.

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