FIG. 1D is an illustration of an anterior target point on the sacrrum FIGS. 1E and IF are cross-sectional caudal views of a lumbar vertebrae depicting one and two trans sacral axial implants respectively within corresponding TASII bores formed in parallel with the visualized AAIIL of FIG. 1C. FIGS. 2A and 2B are a perspective view and a side cross-sectional view of one embodiment of a guide pin in