Why do fractures need to be nailed?

After fracture, normal need to take surgical treatment and non-surgical treatment, surgical treatment is applicable to non-surgical treatment ineffective or fracture displacement obvious patient, then fracture, why to hit steel nail? Because fracture occurs, after reduction, fracture is in an unstable state. In order to provide a good healing condition for the fracture, it is necessary to put the fracture in a relatively stable state. The steel nail can be fixed on the bone to make the bone in a relatively stable state, so that the fracture can heal quickly.