title: A modified laryngoplasty approach promoting ankylosis of the cricoarytenoid joint.
abstract: OBJECTIVE
  To perform a modification to the standard laryngoplasty procedure in vivo that would result in ankylosis of the cricoarytenoid (CA) joint, and determine the stability provided to the abducted arytenoid in vitro.
  
  
  METHODS
  Experimental study.
  
  
  METHODS
  Horses (n=8).
  
  
  METHODS
  Horses were assigned to either control laryngoplasty (n=3) or modified laryngoplasty (5) procedure. Endoscopic upper airway evaluations were used to measure right:left quotients 1 day and 3 months postoperatively to assess maintenance of abduction. Horses were euthanatized 3 months after surgery and larynges collected for measurement of translaryngeal impedance and histologic evaluation of CA joint ankylosis. Each specimen was exposed to increasing negative pressure with the sutures intact or cut while translaryngeal impedance was recorded. Data were analyzed using ANOVA with significance set at P<.05.
  
  
  RESULTS
  Loss of left arytenoid cartilage abduction at 3 months was greater in the control laryngoplasty group. Overall, impedance was significantly lower for the modified laryngoplasty group compared with the control laryngoplasty group and lower with the sutures intact than cut. Histologic evaluation of the joints confirmed fibrous bridging of the left CA joints of the modified laryngoplasty group.
  
  
  CONCLUSIONS
  A modified laryngoplasty approach promotes ankylosis of the CA joint and decreases the loss of abduction of the arytenoid.
authors.affiliation: Department of Clinical Studies, New Bolton Center, University of Pennsylvania School of Veterinary Medicine, Kennett Square, PA 19348, USA. ejp@vet.upenn.edu
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Parente
authors.forename: Eric K
authors.initials: EK
authors.lastname: Birks
authors.forename: Perry
authors.initials: P
authors.lastname: Habecker
mesh_terms: D000818:Animals; D000844:Ankylosis; D001193:Arytenoid Cartilage / Q000473:pathology / Q000601:surgery*; D001696:Biomechanical Phenomena; D003413:Cricoid Cartilage / Q000473:pathology / Q000601:surgery*; D005260:Female; D006734:Horse Diseases / Q000601:surgery*; D006736:Horses; D007593:Joint Instability / Q000601:surgery / Q000662:veterinary*; D058753:Laryngoplasty / Q000379:methods / Q000662:veterinary*; D007828:Laryngoscopy / Q000662:veterinary; D007830:Larynx / Q000473:pathology / Q000502:physiology / Q000601:surgery; D008297:Male; D016896:Treatment Outcome