MODULAR PIVOTABLE SCREW ASSEMBLY AND METHOD

摘要

A bone anchor assembly and a rigid extension rod removably coupleable thereto. The bone anchor assembly includes a screw base and a pivoting post. The post has a first recess in a proximal endface thereof, which may have first threads therein. The extension rod has a distal section separated from a proximal section by an intermediate section. The rod distal section has external threads that are threadingly engageable with the threads of the post recess. The rod third section may have external third threads of a different size. The rod intermediate section has an unthreaded exterior. When the extension rod is coupled to the post, an exterior of the second section of the extension rod is aligned with the exterior of the post. Other connection approaches may be used. An optional spacer may also be used to couple the rod to the post.