1. A dynamic spine stabilization component wherein the dynamic spine stabilization component comprises: a tubular shield having a lumen a proximal end and a distal end; an elongated deflectable post; a ball-shaped retainer at a first end of the deflectable post, wherein the deflectable post is received in the lumen such that the ball-shaped retainer is pivotally associated the distal end of the tubular shield and a second end of the deflectable post extends through the proximal end of the tubular shield; a spring positioned within the lumen between the deflectable post and the tubular shield such that the deflectable post is flexibly aligned with the tubular shield such that deflection of the deflectable post away from alignment with the tubular shield causes elastic deformation of the spring; and a fastening mechanism adapted to selectably secure the tubular shield within a bore in a housing at a proximal end of a bone screw in alignment with a longitudinal axis of the bone screw such that the ball-shaped retainer is trapped within the bore between the distal end of the tubular shield and the bone screw.
6. The dynamic spine stabilization component of claim 1 , wherein said spring comprises a plurality of lever arms deployed around said deflectable post such that deflection of said deflectable post causes elastic bending of said lever arms.