D. Filipowicz (1), O. Lanz (2), R. McLaughlin (3), S. Elder (4), S. Werre (4)
(1) Department of Small Animal Clinical Sciences, Virginia Maryland Regional College of Veterinary Medicine, Virginia, USA; (2) Department of Biomedical Sciences & Pathobiology, Virginia Maryland Regional College of Veterinary Medicine, Virginia, USA; (3) Department of Clinical Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi, USA; (4) Department of Agricultural and Biological Engineering, Mississippi State University, Mississippi, USA
3.5 locking compression plate (LCP) fixation was compared to 3.5 limited contact dynamic compression plate (LC-DCP) fixation in a canine cadaveric, distal humeral metaphyseal gap model. Thirty paired humeri from adult, large breed dogs were separated into equal groups based on testing: static compression, cyclic compression, and cyclic torsion. Humeral constructs stabilised with LCP were significantly stiffer than those plated with LC-DCP when loaded in static axial compression (P = 0.0004). When cyclically loaded in axial compression, the LCP constructs were significantly less stiff than the LC-DCP constructs (P = 0.0029). Constructs plated with LCP were significantly less resistant to torsion over 500 cycles than those plated with LC-DCP (P<0.0001). The increased stiffness of LCP constructs in monotonic loading compared to constructs stabilised with non-locking plates may be attributed to the stability afforded by the plate-screw interface of locking plates. The LCP constructs demonstrated less stiffness in dynamic testing in this model, likely due to plate-bone offset secondary to non-anatomic contouring and occasional incomplete seating of the locking screws when using the torque-limiting screw driver. Resolution of these aspects of LCP application may help improve the stiffness of fixation in fractures modeled by the experimental set-up of this investigation.
LCP, LC-DCP, Fracture model, axial compression, cyclic torsion
M. DeTora1, K. Kraus2
Vet Comp Orthop Traumatol 2008 21 4: 318-322
A. Z. Aguila1 , J. M. Manos2 , A. S. Orlansky2 , R. J. Todhunter1 , E. J. Trotter 1 , M. C. H. van der Meulen2
Vet Comp Orthop Traumatol 2005 18 4: 220-226
F. M. Little, C. M. Hill, T. Kageyama, M. G Conzemius, G. K. Smith
Vet Comp Orthop Traumatol 2001 14 2: 64-68
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