Abstract: A bone screw fixation system includes a bone screw body having a screw head at one end of the screw and a screw tip at an opposite end of the screw, the screw head having an internal complex geometric shaped drive and internal threads within the screw head; and a screw inserter compatible with the screw head and having a complex geometric shaped drive configured to matingly engage the internal complex geometric shaped drive of the screw head and a threaded tip configured to thread into the internal threads of the screw head.

Abstract: A bone screw includes a screw body having a head at one end of the screw and a tip at an opposite end of the screw; head threads directly attached to the screw body and continuous around the head of the screw; tip threads directly attached to the screw body and continuous around the tip of the screw; and overhanging thread portions between the head threads and the tip threads, the overhanging thread portions spaced apart, with unthreaded channels between the overhanging thread portions and the overhanging thread portions overhanging a portion of the unthreaded channels.