The effect of external coaptation on plate deformation in an ex vivo model of canine pancarpal arthrodesis

Author:

Wallace R. J.,Mosley J. R.,Woods S.

Abstract

SummaryObjectives: Since external coaptation is applied clinically to prevent plate failure during healing in canine pancarpal arthrodesis (PCA), we tested the hypothesis that external coaptation does not significantly reduce plate strain in an experimental ex vivo model of canine PCA.Methods: Ten thoracic limbs from healthy Greyhounds euthanatized for reasons un- related to the study were harvested and the carpus was stabilised with a dorsally applied 2.7/3.5 mm hybrid PCA plate. The strain in the plate adjacent to the most distal radial screw hole (R4) and the radial carpal bone (RCB) screw hole was measured as the limbs were loaded axially to a load that approximated that of controlled walking. Each limb was tested with and without external coaptation in place.Results: Mean strain amplitude at the RCB was –177.2 με (± 20.78) without external coaptation. Following cast application, strain reduced significantly to –34.7 με (± 9.84) (p <0.002). Mean strain at R4 was –89.4 με (± 22.10) without external support and –66.9 με (± 10.74) following application of a cast. This reduction in recorded strain was not statistically significant.Clinical significance: The application of a cast to the distal portion of the limb significantly reduced strain in the 2.7/3.5 mm hybrid PCA plate, but the magnitude of the measured strain was low, suggesting that fatigue damage is unlikely to accumulate as a result of this type of loading and that external coaptation may not be necessary to prevent fatigue failure of the plate.

Publisher

Georg Thieme Verlag KG

Subject

General Veterinary,Animal Science and Zoology

Reference29 articles.

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3. Fractures and other orthopedic conditions of the carpus, metacarpus, and phalanges. In: Piermattei DL, Flo GL, DeCamp CE, editors. Brinker, Piermattei, and Flo's Handbook of Small Animal Orthopedics and Fracture Repair. 4th ed. St. Louis, Mo.: Saunders/Elsevier; 2006. pg. 382-428

4. CARPAL ARTHRODESIS IN DOGS

5. Arthrodesis

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