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Comparison of three miniplate systems in experimentally induced ulnar and radial fractures in pigeons (Columba livia)


Gull, J. Comparison of three miniplate systems in experimentally induced ulnar and radial fractures in pigeons (Columba livia). 2011, University of Zurich, Vetsuisse Faculty.

Abstract

Although bone plates have advantages over other fixation methods for certain indications, they are still uncommonly used in avian fracture repair. One reason are the thin cortices of avian bones. They lead to a reduced screw holding power. Another reason was that until now there was no evaluated plating system appropriate and available for the use of fracture repair in smaller birds. Therefore a study with three different miniplate systems was carried out. Three groups (A, B and C) of six pigeons (Columba livia) each were used. The left ulna and radius of the pigeons were transected and the ulna was repaired with a bone plate. Three plate systems were used: in group A, a 1.3 adaption plate; in group B the same plate with washers to achieve a limited contact system; in group C a maxillofacial miniplate. Healing was evaluated with radiographs after two and four weeks, a flight test was performed after 4 weeks, and a necropsy of the wing was carried out. Group A achieved the best flight results (100% good). In group B no effect of the limited contact concept was visible at necropsy and a high percentage of screws loosened which led to repair failure (33%). The maxillofacial miniplates of group C were too weak and bent (100%). In conclusion only the adaption plate 1.3 met the requirements for avian osteosynthesis. To adapt the system better to the properties of avian bone, further trials using smaller drill bits or screws with a smaller thread pitch should be carried out.

Abstract

Although bone plates have advantages over other fixation methods for certain indications, they are still uncommonly used in avian fracture repair. One reason are the thin cortices of avian bones. They lead to a reduced screw holding power. Another reason was that until now there was no evaluated plating system appropriate and available for the use of fracture repair in smaller birds. Therefore a study with three different miniplate systems was carried out. Three groups (A, B and C) of six pigeons (Columba livia) each were used. The left ulna and radius of the pigeons were transected and the ulna was repaired with a bone plate. Three plate systems were used: in group A, a 1.3 adaption plate; in group B the same plate with washers to achieve a limited contact system; in group C a maxillofacial miniplate. Healing was evaluated with radiographs after two and four weeks, a flight test was performed after 4 weeks, and a necropsy of the wing was carried out. Group A achieved the best flight results (100% good). In group B no effect of the limited contact concept was visible at necropsy and a high percentage of screws loosened which led to repair failure (33%). The maxillofacial miniplates of group C were too weak and bent (100%). In conclusion only the adaption plate 1.3 met the requirements for avian osteosynthesis. To adapt the system better to the properties of avian bone, further trials using smaller drill bits or screws with a smaller thread pitch should be carried out.

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Additional indexing

Item Type:Dissertation
Referees:Hatt J M, Montavon P M
Communities & Collections:05 Vetsuisse Faculty > Veterinary Clinic > Department of Small Animals
Dewey Decimal Classification:570 Life sciences; biology
630 Agriculture
Language:English
Date:2011
Deposited On:08 Jan 2012 13:47
Last Modified:05 Apr 2016 15:19
Number of Pages:92
Related URLs:http://opac.nebis.ch/F/?local_base=EBI01&con_lng=GER&func=find-b&find_code=090&request=001982630
http://opac.nebis.ch/F/?local_base=NEBIS&CON_LNG=GER&func=find-b&find_code=SYS&request=006391784

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