Extension ready spinal support systems

摘要: An “extension ready” spinal support system that enables the extension to be accomplished with minimal disturbance an existing structure which is coupled. In some embodiments, rod and pedicle screws can remain intact while subassemblies are mounted directly base receptacles. The include a skirt portion surrounds engages receptacle prevent splaying of receptacle. Additional resistance may provided by canted thread arrangement between low profile (i.e., shortened axial length from receptacle) providing monoaxial rotation rotates about but does not pitch relative axis shorter polyaxial structures.