PINLESS EXTERNAL FIXATION OF MANDIBLE FRACTURES IN CATTLE

Objective- This report describes our experience with a new technique f or stabilization of mandibular fractures in cattle using a pinless ext ernal fixator. Study Design- Mandibular fractures were stabilized with a pinless external fixator, which is a modification of a unilateral A O/ASIF (association for the Study of internal Fixation)-fixator in whi ch pins are replaced with bane clamps. Animals- Seven dairy cattle bet ween 1 and 5 years of age. Methods- Fracture stabilization was achieve d by using the pinless external fixator. Postoperative management incl uded intravenous administration of sodium chloride-glucose and antibio tics. A suspension of ruminal contents from a normal cow together with linseed and grass pellets was administered with a gastric tube. Resul ts- Three to 10 days after surgery six of seven cows masticated comfor tably. The only failure was a yearling with a 10-day-old open infected fracture. This animal was slaughtered 9 days after surgery because of additional problems. In six cases there was enough callus formation 3 3 to 54 days after surgery to stabilize the fracture. The fixation dev ices were removed under heavy sedation. The major complication was bon e sequestration at the fracture site, which required additional treatm ent. Conclusion- The pinless fixator has proven satisfactory for exter nal stabilization of unilateral horizontal ramus fractures of the mand ible in cattle. Clinical Relevance- The technique provides good stabil ity without penetration of the medullary cavity and damage to the toot h roots. Other advantages of the technique include ease of application , minimal surgical trauma, and the short surgical time for application . (C) Copyright 1997 by The American College of Veterinary Surgeons