title: Volume analysis of preadipocyte injection for vocal cord medialization.
abstract: OBJECTIVE
  To compare the volume retention of injected preadipocytes with that of standard fat injection in a paralyzed rabbit true vocal cord.
  
  
  METHODS
  Prospective analysis with blinded data collection.
  
  
  METHODS
  Thirteen New Zealand white rabbits were divided into two groups. Group 1 consisted of seven animals undergoing left-side vocal cord paralysis by resection of a 1-cm segment of the left-side recurrent laryngeal nerve and abdominal fat harvest for isolation of preadipocytes. Preadipocytes were cultured under sterile conditions in cell culture media. Animals in group 2 also underwent left-side vocal cord paralysis without fat harvest. After 10 to 14 days, in a second procedure, group 1 underwent injection of 0.1 mL cultured autologous preadipocytes, and group 2 underwent routine injection of 0.1 mL abdominal fat harvested during the same procedure. At 6 and 12 months, volumetric analysis was performed.
  
  
  RESULTS
  Volume analysis at 6 months showed a mean volume of 0.029 mL retained fat in group 2 representing a retention of approximately 29% (SD = 0.023) of the original injected volume. Retention in group 1 animals approximated 0.002 mL (SD = 0.0024) or 2% of the injected volume. Analysis at 12 months showed a mean volume of 0.008 mL (SD = 0.0078) in group 2 and of 0.002 mL (SD = 0.0015) in group 1. Group 2 showed significantly higher volumes of the injected fat at 6 and 12 months (P <.033).
  
  
  CONCLUSIONS
  Volumes obtained with standard fat injection were superior to those obtained with preadipocyte injection at both 6 and 12 months.
authors.affiliation: Department of Otolaryngology-Head & Neck Surgery, Southern Illinois University School of Medicine, 301 North 8th Street, Springfield, IL, USA. fglutz@siumed.edu
authors.forename: Frank R
authors.initials: FR
authors.lastname: Glatz
authors.forename: James
authors.initials: J
authors.lastname: Kalkanis
authors.forename: Michael
authors.initials: M
authors.lastname: Neumeister
authors.forename: Hans
authors.initials: H
authors.lastname: Suchy
authors.forename: Sharon
authors.initials: S
authors.lastname: Lyons
authors.forename: Arian
authors.initials: A
authors.lastname: Mowlavi
authors.forename: Arian
authors.initials: A
authors.lastname: Mowlawi
mesh_terms: D017667:Adipocytes / Q000166:cytology / Q000637:transplantation*; D000273:Adipose Tissue / Q000473:pathology / Q000637:transplantation; D000818:Animals; D002478:Cells, Cultured; D005260:Female; D006085:Graft Survival; D007267:Injections; D007821:Laryngeal Muscles / Q000473:pathology; D009852:Omentum; D011817:Rabbits; D033581:Stem Cell Transplantation; D014182:Transplantation, Autologous; D014826:Vocal Cord Paralysis / Q000473:pathology / Q000628:therapy*; D014827:Vocal Cords / Q000473:pathology