The classification of such soft-tissue wounding is according to two systems, namely that of Gustilo, Mendoza & Williams (See: Gustilo RB, Mendoza RM, Williams DN (1984) Problems in the management of type III (severe) open fractures. A new classification of type III open fractures. J.Trauma Aug;24(8):742-6); and also that of the AO.
An additional influence is the ability of the host to combat infection, based on both systemic and local factors. For details see