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Biomechanical comparison of dual bone fixation in an ex-vivo mid-diaphyseal fracture model of the feline radius and ulna

Preston, Timothy (2015) Biomechanical comparison of dual bone fixation in an ex-vivo mid-diaphyseal fracture model of the feline radius and ulna. Other thesis, Murdoch University.

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Abstract

This investigation was conducted in two phases. The first phase aim was to describe the length, internal and external diameter, cancellous bone volume/extent and cortical bone thickness at predetermined locations in the radius and ulna in a cohort of skeletally mature and disease-free cat cadavers using radiography and computed tomography. This phase provided a morphometric description of normal cat antebrachii and served as reference for implant selection for the second phase. The aim of the second phase was to compare the biomechanical properties of three constructs for dual bone fixation (DBF) in a cat ex vivo antebrachial, fracture-gap model. Twelve cat cadaver antebrachii were radiographed to confirm normal skeletal appearance and maturity. Antebrachii were allocated for application of one of three constructs in an incomplete randomised block design (n=8/group); 10-hole 1.5/2.0mm Synthes® LCP radial plate (P); Plate and 1.2mm ulna intramedullary pin (PI) and Plate with an 8-hole 1.5/2.0mm orthogonal Synthes® ulna LCP plate (PP). Dual bone fixation constructs were PP and PI with P used as a control. Constructs were tested in non-destructive mediolateral and caudocranial four point bending, axial compression and finally axial compression to failure. Dual bone fixation constructs (PI and PP) were significantly stiffer (P< 0.001) than P in axial compression and caudocranial bending. There was no difference between PI and PP in axial compression and caudocranial bending (P=0.28) and no difference between any construct in mediolateral bending (P=0.72). The failure load was significantly greater for PP than PI (P<0.001) and PP and P (P<0.001) respectively. There was no difference between PI and P failure loads (P=0.45). In this cat ex vivo fracture-gap model, DBF (PP and PI) constructs were significantly stiffer in axial compression and caudocranial bending than radial plate alone. Dual plate constructs had a significantly higher failure load than any other construct.

Publication Type: Thesis (Other)
Murdoch Affiliation: School of Veterinary and Life Sciences
Notes: Research Masters and Training
Supervisor: Hosgood, Giselle and Glyde, Mark
URI: http://researchrepository.murdoch.edu.au/id/eprint/27566
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