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A Biomechanical Evaluation of a Hybrid Dynamic Compression Plate and a Cast L ess Arthrodesis Plate for Pancarpal Arthrodesis in Dogs
Author(s) -
Meeson Richard L.,
Goodship Allen E.,
Arthurs Gareth I.
Publication year - 2012
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2012.00985.x
Subject(s) - arthrodesis , bending , compression (physics) , medicine , stiffness , bending of plates , bending stiffness , dynamic compression plate , composite material , materials science , surgery , internal fixation , pathology , alternative medicine
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 10 6 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 Nm 2 ) versus CLP (2.9 ± 0.2 N m 2 ; P = .0022). A difference between the 2 plates for bending strength was not demonstrated; HDCP = 13.9 ± 1.4 N m, CLP 13.2 ± 0.5 N m ( P = .24). Cyclic Loading: no failures occurred with either plate type when plates were cycled to 10 6 cycles. Conclusion There is no mechanical advantage in bending resistance afforded by the CLP over 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 CLP over the HDCP for castless PCA .