Mechanical Evaluation of Two Hybrid Locking Plate Designs for Canine Pancarpal Arthrodesis

Hybrid locking pancarpal arthrodesis plates were designed with either a round (RH) or an oval (OH) radiocarpal hole, the latter allowing varied screw positioning. Due to concerns about potential decreased structural properties of the OH design, our aim was to compare the mechanical behavior of the c...

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Bibliographic Details
Published in:BioMed research international 2021-09, Vol.2021, p.1-8
Main Authors: Zderic, Ivan, Varga, Peter, Styger, Ursula, Drenchev, Ludmil, Gueorguiev, Boyko, Asimus, Erik, Saunders, W. Brian, Kowaleski, Michael, Boudrieau, Randy J., Dejardin, Loic M.
Format: Article
Language:English
Subjects:
Arthrodesis
Bending
Biomechanics
Bones
Care and treatment
Carpal bones
Compliance
Deformation
Design
Diseases
Dogs
Equipment and supplies
Fatigue failure
Finite element method
Fixation
Fractures
Gauges
Health aspects
Locking
Mathematical models
Mechanical properties
Mechanical tests
Metacarpal
Methods
Patient outcomes
Plates
Statistical analysis
Strain distribution
Strain gauges
Transplants & implants
Variance analysis
Veterinary surgery
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Summary:Hybrid locking pancarpal arthrodesis plates were designed with either a round (RH) or an oval (OH) radiocarpal hole, the latter allowing varied screw positioning. Due to concerns about potential decreased structural properties of the OH design, our aim was to compare the mechanical behavior of the contrasting plates using combined finite element analysis (FEA) and mechanical testing. Pancarpal arthrodesis plates with RH or OH design were assigned to three fixation techniques (n=6), prebent at 20°, and fixed to canine forelimb models with simulated radius and radiocarpal and 3rd metacarpal bones. OH plates were instrumented with a radiocarpal screw inserted either most proximal (OH-P) or most distal (OH-D). Specimens were axially loaded to 300 N over 10 ramped cycles at 0.5 Hz. Plate strains were measured with strain gauges placed at areas of highest deformations as predicted by FEA under identical loading conditions. FEA predicted the highest strains (μm/m) adjacent to the radiocarpal hole (2,500 [RH], 2,900 [OH-P/OH-D]) and plate bending point (2,250 [RH], 1,900 [OH-P/OH-D]). Experimentally, peak radiocarpal hole strains were not influenced by the OH screw position (3,329±443 [OH-P], 3,222±467 [OH-D]; P=0.550) but were significantly higher compared to the RH design (2,123±154; P
ISSN:2314-6133
2314-6141
DOI:10.1155/2021/2526879