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In vitro evaluation of a novel prosthesis for laryngoplasty of horses with recurrent laryngeal neuropathy
Author(s) -
Schumacher J.,
Wilson A. M.,
Pardoe C.,
Easter J. L.
Publication year - 2000
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.2746/042516400777611991
Subject(s) - prosthesis , laryngoplasty , medicine , surgery , fibrous joint , larynx , displacement (psychology) , prosthesis implantation , cadaveric spasm , psychology , psychotherapist
Summary A prosthesis, composed of a steel cable and stress‐reducing washers, was developed to prevent failure of laryngoplasty, a common treatment for horses affected by recurrent laryngeal neuropathy. Laryngoplasties were performed on 15 cadaveric larynges using a polyester suture on one side and the cable prosthesis on the other. Each prosthesis was distracted at a displacement rate of 20 mm/s using a servohydraulic materials testing machine until laryngoplasty failed. Distraction force and actuator displacement were recorded and analysed. All 15 laryngoplasties performed with a suture failed at the muscular process at a mean ± s.d. force of 55.8 ± 13.1 N. Six laryngoplasties performed with the cable prosthesis failed at the muscular process at mean force 219.6 ± 125.0 N. In the other 9, the arytenoid cartilage was avulsed from the larynx at mean force 206.4 ± 75.3 N, and the cable then tore through the muscular process at mean force 357.0 ± 32.0 N. The difference in force required to cause failure of laryngoplasty was significant (P<0.0001). Although the prosthesis resisted substantially higher forces than did the suture, the effects of the prosthesis in vivo must be evaluated.