#$%^&*AU2015200634A120150903.pdf#####A spinal fixation device, comprising: a body portion including a stud portion defining a first annular groove; an outer housing positionable on the stud portion; an inner housing defining a second annular groove, the inner housing positionable between the outer housing and the stud portion; and a ring member positionable within each of the first and second annular grooves of the respective stud portion and inner housing to lock the inner housing to the stud portion and to fixedly couple the outer housing to the stud portion. 14/10 CD CV) 0 % C C%4 C% CNN C%4N CU