ALLOGRAFT BONE FIXATION SCREW METHOD AND APPARATUS

摘要

A bone screw assembly constructed of allograft bone comprising a screw sha nk with a uniform diameter threaded portion, an unthreaded portion with a outwardly tapered end terminating in a drive head defining a wedge shaped configuration to form an undercut for the drive head. In operation a bore is drilled in the two bone sections, with one bone secti on being over drilled with the top portion of the over drilled bore having a tapered geometry which widens from the diameter of the bore. The bone screw is driven into th e previously cut bore in the bone sections until the tapered surface of the bore engages the tapered undercut surface of the screw.