Patent ID: 8875399

Claim:
A method for dispersing forces experienced by a fastener tapped and embedded in a surrounding bone, comprising: negating radially outward spreading forces which would otherwise exist during fastener insertion by forming a thread pattern on the fastener drawing the surrounding bone towards the fastener; negating dynamic loads imposed on the fastener after embedment by fashioning the thread pattern to offset loads parallel to a longitudinal axis ( 31 ) of the fastener and loads not parallel to the longitudinal axis ( 31 ) such that the thread pattern and the surrounding bone form an interlocking connection there between; wherein the tapped bone having a plurality of surfaces ( 41 , 42 ) and the thread pattern having a thread ( 24 a ) including a plurality of contact surfaces ( 34 , 35 , 38 ); and forming complimentary contours on the thread pattern at an interface between the tapped bone and the embedded fastener such that a vector force ( 51 ) having an inward radial component toward longitudinal axis ( 31 ) exerted by the tapped bone acts upon the contact surface ( 34 ) of the thread by the surface ( 41 ) of the tapped bone, a vector reactive force ( 52 ) having an inward radial component toward longitudinal axis ( 31 ) exerted by the tapped bone acts upon the surface ( 38 ) of the thread by means of surface ( 44 ) of the tapped bone; and a vector reactive force ( 53 ) having an outward radial component toward longitudinal axis ( 31 ) exerted by the tapped bone acts upon the surface ( 35 ) of the thread by means of surface ( 42 ) of the tapped bone to provide a net centering force.