title: New, simple, ultrasound-guided infiltration of the pudendal nerve: ultrasonographic technique.
abstract: OBJECTIVE
  Anesthetic infiltration of the pudendal nerve at the ischial spine can relieve perineal pain in cases of compression or distention. The aim of our study was to look for a real-time, visually controlled infiltration technique using ultrasound.
  
  
  METHODS
  Fifty-three volunteers were examined in a prone position using a 3.5-MHz curved-array probe in color-coded Doppler mode. The deep gluteal region was scanned in two perpendicular planes, longitudinal and transverse to the internal pudendal artery.
  
  
  RESULTS
  On the transverse planes the ischial spine, the sacrospinous ligament, and the internal pudendal artery were depicted in all but two cases. In 47.2 percent of the cases one trunk of the pudendal nerve was detected directly. Nerves consisting of more than one trunk were not found. The thickness of the nerve ranged between 3.5 and 7 mm.
  
  
  CONCLUSIONS
  In almost one-half of the cases a direct ultrasound-guided infiltration of the pudendal nerve is possible. In the remaining cases the nerve can be detected and blocked indirectly, using the ischial spine or the internal pudendal artery as a landmark.
authors.affiliation: Institute of Anatomy and Histology, University Hospital, Innsbruck, Austria.
authors.forename: P
authors.initials: P
authors.lastname: Kovacs
authors.forename: H
authors.initials: H
authors.lastname: Gruber
authors.forename: J
authors.initials: J
authors.lastname: Piegger
authors.forename: G
authors.initials: G
authors.lastname: Bodner
mesh_terms: D000293:Adolescent; D000328:Adult; D002102:Cadaver; D005260:Female; D006801:Humans; D008160:Lumbosacral Plexus / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009407:Nerve Block / Q000379:methods*; D010146:Pain; D017773:Pelvic Floor / Q000473:pathology; D010502:Perineum / Q000473:pathology; D012445:Sacrococcygeal Region / Q000098:blood supply / Q000000981:diagnostic imaging / Q000294:innervation; D018084:Ultrasonography, Interventional / Q000379:methods*; D014741:Video Recording