title: An experimentally successful new sphincter-conserving treatment for anal fistula.
abstract: OBJECTIVE
  A new sphincter-conserving treatment was evaluated in a porcine model.
  
  
  METHODS
  A total of 36 fistulas were created by procedures that have been published previously. At fistula induction a skin biopsy was taken from which to culture fibroblasts. Four weeks after induction, when fistulas were well established, the fistula tracks were cored out. Collagen paste modified from Permacol injection (Covidien, Mansfield, MA) was then used as a solitary infill material in 11 tracks, cultured autologous fibroblasts being added to this in a further 18 tracks. The track was cored out in seven controls, but these tracks were not treated with infill material. All of the internal and external openings were closed. Anorectal excision was then carried out under terminal anesthesia at 2 to 12 weeks. Histologic examination of individual tracks was performed by an experienced pathologist.
  
  
  RESULTS
  In this quadruped all of the infilled tracks healed, autologous fibroblasts having the best tissue integration, but only two of seven control tracks healed.
  
  
  CONCLUSIONS
  Removal of the fistula track followed by injection of collagen healed all of the cases. The addition of autologous fibroblasts improved the histologic appearance of the tracks. A pilot study in human fistula patients is in progress.
authors.affiliation: Department of Surgery, St. Mark's Hospital, Harrow, United Kingdom.
authors.forename: Rebecca C
authors.initials: RC
authors.lastname: Himpson
authors.forename: C Richard G
authors.initials: CR
authors.lastname: Cohen
authors.forename: Paul
authors.initials: P
authors.lastname: Sibbons
authors.forename: Robin K S
authors.initials: RK
authors.lastname: Phillips
mesh_terms: D001003:Anal Canal; D000818:Animals; D001672:Biocompatible Materials / Q000008:administration & dosage; D003094:Collagen / Q000008:administration & dosage; D004195:Disease Models, Animal; D005260:Female; D015552:Injections, Intralesional; D012003:Rectal Fistula / Q000473:pathology / Q000601:surgery*; D013552:Swine
chemical_list: D001672:Biocompatible Materials; C422414:Permacol; D003094:Collagen