A Biomechanical Evaluation of a Hybrid Dynamic Compression Plate and a CastLess Arthrodesis Plate for Pancarpal Arthrodesis in Dogs
Objective To determine mechanical differences between two plates with different requirements for supplementary casting after pancarpal arthrodesis (PCA): the Veterinary Instrumentation Hybrid Dynamic Compression Plate (HDCP), and the OrthoMed CastLess Arthrodesis Plate (CLP). Study Design In vitro m...
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Published in | Veterinary surgery Vol. 41; no. 6; pp. 738 - 744 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
Blackwell Publishing Ltd
01.08.2012
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Subjects | |
Online Access | Get full text |
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Summary: | Objective
To determine mechanical differences between two plates with different requirements for supplementary casting after pancarpal arthrodesis (PCA): the Veterinary Instrumentation Hybrid Dynamic Compression Plate (HDCP), and the OrthoMed CastLess Arthrodesis Plate (CLP).
Study Design
In vitro mechanical analysis.
Sample Population
HDCP(n = 10), CLP(10).
Methods
Single‐cycle load to failure using a materials‐testing machine and cyclic loading between 38 and 380 N ± 5% to simulate estimated in vivo loads until failure or 106 cycles.
Results
Single‐cycle to failure: bending stiffness was significantly higher for the HDCP(2269 ± 175 N/mm) than CLP(1754 ± 88 N/mm; P < .001). Bending structural stiffness was higher for the HDCP(3.8 ± 0.3 Nm2) versus CLP(2.9 ± 0.2 Nm2; P= .0022). A difference between the 2 plates for bending strength was not demonstrated; HDCP= 13.9 ± 1.4 Nm, CLP13.2 ± 0.5 Nm (P= .24). Cyclic Loading: no failures occurred with either plate type when plates were cycled to 106 cycles.
Conclusion
There is no mechanical advantage in bending resistance afforded by the CLPover the HDCP. Fatigue failure of either plate during the convalescent period of an estimated 150,000–250,000 cycles is unlikely. Based on the bending performance, there is no evidence to support the use of the CLPover the HDCPfor castless PCA. |
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Bibliography: | istex:CE91921BAA0C439A4F396E50935E3C0FF6679A81 ark:/67375/WNG-C9WFHZT6-N British Veterinary Orthopaedic Association ArticleID:VSU985 Presented in part at the BVOA Spring Scientific Meeting, Birmingham, UK, 2011 Work conducted at the Musculoskeletal Laboratory, Royal Veterinary College. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0161-3499 1532-950X |
DOI: | 10.1111/j.1532-950X.2012.00985.x |