RT Journal Article SR Electronic T1 Anatomical considerations for obturator nerve block with fascia iliaca compartment block JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 806 OP 812 DO 10.1136/rapm-2021-102553 VO 46 IS 9 A1 Thomas Fichtner Bendtsen A1 Erik Morre Pedersen A1 Bernhard Moriggl A1 Peter Hebbard A1 Jason Ivanusic A1 Jens Børglum A1 Thomas Dahl Nielsen A1 Philip Peng YR 2021 UL http://rapm.bmj.com/content/46/9/806.abstract AB This report reviews the topographical and functional anatomy relevant for assessing whether or not the obturator nerve (ON) can be anesthetized using a fascia iliaca compartment (FIC) block. The ON does not cross the FIC. This means that the ON would only be blocked by an FIC block if the injectate spreads to the ON outside of the FIC. Such a phenomena would require the creation of one or more artificial passageways to the ON in the retro-psoas compartment or the retroperitoneal compartment by disrupting the normal anatomical integrity of the FI. Due to this requirement for an artificial pathway, an FIC block probably does not block the ON.