RT Journal Article SR Electronic T1 Practical Knobology for Ultrasound-Guided Regional Anesthesia JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP S68 OP S73 DO 10.1097/AAP.0b013e3181d245f9 VO 35 IS Suppl 1 A1 Brull, Richard A1 Macfarlane, Alan J.R. A1 Tse, Cyrus C.H. YR 2010 UL http://rapm.bmj.com/content/35/Suppl_1/S68.abstract AB This article provides an instructive review of the essential functions universal to modern ultrasound machines in use for regional anesthesia practice. An understanding of machine knobology is integral to performing safe and successful ultrasound-guided regional anesthesia.