 Residual osteophytes and disc fragments were removed with 1 and 2-mm micro Kerrison rongeurs as necessary as drilling extended into normal cortical and cancellous elements widely laterally as well. 
Residual osteophytes and disc fragments were removed with 1 and 2 - mm micro Kerrison rongeurs as necessary as drilling extended into normal cortical and cancellous elements widely laterally as well .