Rongeurs are used in lumbar spine procedures to remove spinous process on vertebra and for other bone removal processes. Popular patterns include Duckbill, Stille-Luer Horsley, Leksell, Kerrison rongeurs for use in removing smaller quantities of bone, Pituitary rongeurs for removal of disc and other tissues in confined areas. Other commonly used patterns include micro, Williams pituitary, and peapod rongeurs.