This trough was completed to the level of the ligamentum flavum using small angled curettes and Kerrison rongeurs, and this portion of the lamina along with the inferior L4 articular process was then removed as a unit using rongeurs and curettes. 
This trough was completed to the level of the ligamentum flavum using small angled curettes and Kerrison rongeurs , and this portion of the lamina along with the inferior L4 articular process was then removed as a unit using rongeurs and curettes .