Locking plates have been shown to offer improved fixation in fractures involving either osteoporotic bone or bone with lesser screw pullout strength, such as thin and flat bones. Fractures of the scapular body are one type of fracture where the screw pullout strength using conventional plate fixation may not be sufficient to overcome physiologic forces. The purpose of this study was to compare the pullout strengths of locking plates to conventional nonlocking plates in the canine scapula. A 2.7 mm string of pearls plate (SOP) and a 2.7 mm limited contact dynamic compression plate (LC-DCP) were applied with similar divergent screws to the supraspinatus fossa of the scapula. Forces perpendicular to the plates were applied and both the loads at failure and modes of failure were recorded. No differences were noted in loads at failure between the two plating systems. Although the modes of failure were not significantly different, the SOP constructs tended to fail more often by bone slicing and coring, whereas the LC-DCP constructs failed primarily by screw stripping. Neither of the plate systems used in this study demonstrated a distinct mechanical advantage. The application and limitations of locking plate systems in various clinical situations require further study.
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November/December 2012
Original Studies|
November 01 2012
Biomechanical Testing of Locking and Nonlocking Plates in the Canine Scapula
Anthony E. Acquaviva, VMD;
Department of Small Animal Surgery, Veterinary Medical Center (A.A., E.M., K.K.), Center for Nondestructive Evaluation (D.E.), and Department of Industrial and Manufacturing Systems Engineering (R.S.), Iowa State University of Science and Technology, Ames, IA.
Correspondence: [email protected] (A.A.)
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Emily I. Miller, DVM;
Department of Small Animal Surgery, Veterinary Medical Center (A.A., E.M., K.K.), Center for Nondestructive Evaluation (D.E.), and Department of Industrial and Manufacturing Systems Engineering (R.S.), Iowa State University of Science and Technology, Ames, IA.
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David J. Eisenmann, MS;
David J. Eisenmann, MS
Department of Small Animal Surgery, Veterinary Medical Center (A.A., E.M., K.K.), Center for Nondestructive Evaluation (D.E.), and Department of Industrial and Manufacturing Systems Engineering (R.S.), Iowa State University of Science and Technology, Ames, IA.
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Rick T. Stone, PhD;
Rick T. Stone, PhD
Department of Small Animal Surgery, Veterinary Medical Center (A.A., E.M., K.K.), Center for Nondestructive Evaluation (D.E.), and Department of Industrial and Manufacturing Systems Engineering (R.S.), Iowa State University of Science and Technology, Ames, IA.
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Karl H. Kraus, MS, DVM, DACVS
Karl H. Kraus, MS, DVM, DACVS
Department of Small Animal Surgery, Veterinary Medical Center (A.A., E.M., K.K.), Center for Nondestructive Evaluation (D.E.), and Department of Industrial and Manufacturing Systems Engineering (R.S.), Iowa State University of Science and Technology, Ames, IA.
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J Am Anim Hosp Assoc (2012) 48 (6): 372–378.
Citation
Anthony E. Acquaviva, Emily I. Miller, David J. Eisenmann, Rick T. Stone, Karl H. Kraus; Biomechanical Testing of Locking and Nonlocking Plates in the Canine Scapula. J Am Anim Hosp Assoc 1 November 2012; 48 (6): 372–378. doi: https://doi.org/10.5326/JAAHA-MS-5804
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