title: Stereophotogrammetry of the perineum during vaginal delivery.
abstract: OBJECTIVE
  To analyze deformation of the perineum during normal vaginal delivery in order to identify clinical steps that might be beneficial when executing manual perineal protection.
  
  
  METHODS
  The present prospective study at Charles University Hospital, Pilsen, Czech Republic, enrolled 10 primiparous women at term undergoing non-instrumental vaginal delivery assisted by the same obstetrician between September 2009 and September 2010. A modified hands-poised technique performed concurrently with stereophotogrammetry was used to analyze and quantify perineal deformation and strain at the final stage of delivery.
  
  
  RESULTS
  The highest tissue strain (mean, 177%; 95% confidence interval [CI], 106.3-248.5) was in a transverse direction and occurred at the level of the fourchette (i.e. 1cm was transversely stretched and deformed to 2.77 cm during the final stage of vaginal delivery). This strain was more than 4 times higher than the maximum anteroposterior strain (mean, 43%; 95% CI, 28.6-57.4).
  
  
  CONCLUSIONS
  On the basis of these stereophotogrammetry data, a technique of perineal protection executed by fingers of the posterior (right) hand can be proposed. Further experimental and clinical studies are needed to evaluate whether this technique might assist in reducing obstetric perineal trauma.
authors: Department of Mechanics, University of West Bohemia, Pilsen, Czech Republic.
authors: Robert
authors: R
authors: Zemčík
authors: Jaroslava
authors: J
authors: Karbanova
authors: Vladimir
authors: V
authors: Kalis
authors: Libor
authors: L
authors: Lobovský
authors: Magdalena
authors: M
authors: Jansová
authors: Zdenek
authors: Z
authors: Rusavy
mesh_terms: D000328:Adult; D036861:Delivery, Obstetric / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007744:Obstetric Labor Complications / Q000517:prevention & control*; D010502:Perineum / Q000293:injuries*; D010780:Photogrammetry; D011247:Pregnancy; D011446:Prospective Studies; D055815:Young Adult