Abstract: A spinal jack adapted for installation between first and second vertebral processes and includes a three dimensional and arcuate ergonomic main body constructed from a first and second portions, from which is displaceable an upper body between each of retracted and expanded positions. Each of the jack halves includes gripping portions adapted for engaging the vertebral processes. A worm gear mechanism includes a central horizontally arrayed and rotatable worm gear supported within the main body and accessible through an inlet aperture. A tool bit is engageable with a bit receiving location of the worm gear which is accessible through the inlet aperture.

Abstract: A spinal jack adapted for installation between first and second vertebral processes, including a three dimensional and arcuate ergonomic main body constructed from first and second subset body portions, from which is displaceable an upper body between retracted and expanded positions. Each of the jack halves further includes gripping portions adapted for engaging the vertebral processes. A geared mechanism is provided for expanding or retracting the jack halves in order to establish a corrected adjusted orientation between the processes.