Abstract: A bone alignment assembly is disclosed having bone anchor subassemblies for securing to both bones and a bone position retainer, wherein the bone position retainer includes a longitudinal member for maintaining a desired alignment of the bones when the bone anchor assemblies are secured to the bone position retainer. Each of the bone anchor subassemblies includes a shaft and one or more pairs of components (e.g., washers) wherein the components of each pair have mating spherical concave and convex surfaces that can mate together in a plurality of angular positions. When the shaft extends through each of the pairs of mating components, and also through a passageway of the bone position retainer that is sandwiched between the two pairs of mating components, the shaft can be secured at any one of a plurality of orientations relative to the bone position retainer.

Abstract: A dorsally placed transacrally fixed surgical implant is described for correcting and supporting the spinal column with the implant being particularly useful for aligning and stabilizing the lumbosacral junction. Direct sacral fixation is achieved utilizing a contoured metallic base plate that is firmly fixed to the sacrum by means of a plurality of screws, which screws are angularly disposed with respect to one another to maximize retention of the base plate on the sacrum. A pair of spine engagable rods, contoured to the desired spinal column configuration, have one end inserted into sockets on the base plate with the rods being locked against rotation or other movement relative to the base plate.