 Bone was then removed with 2 mm Kerrison punch and then we were able to traverse the posterior longitudinal ligament and this ligament was now removed in a piecemeal fashion with a 2 mm Kerrison punch. 
Bone was then removed with 2 mm Kerrison punch and then we were able to traverse the posterior longitudinal ligament and this ligament was now removed in a piecemeal fashion with a 2 mm Kerrison punch .