Study of different ratio of radial cortex and medulla in toy breeds
Date Issued
2012
Date
2012
Author(s)
Hsieh, Chia-Lun
Abstract
Distal radial/ulnar fracture is a common orthopedic condition in toy breed dogs, which can be developed even after a short fall. The strength of bone is from its mineral deposit and geometrical parameters. The latter includes cross-sectional area (CSA), cross-sectional moments of inertia (Ip), mean cortical thickness, and cortical thicknesses. These factors all affect the mechanical behavior of bones. Toy Poodle, Maltese and Pomeranian are popular toy breed dogs in Taiwan. However, distal radial fractures were more common in Toy Poodles and Pomeranians. In previous studies, the ratio of cortex and medulla of radius is different between large, medium and toy breed dogs. However, geometrical differences of radius among different toy breed dogs have never been studied. The aim of the present study is to compare different parameters in these breeds of dogs. Radial/ulnar radiographic images of toy breed dogs collected from imaging database of the National Taiwan University Veterinary Hospital from March 2004 to March 2012 were used. Through ANOVA statistical analysis, significant differences were noted in bone length, bone diameter, and cortex/medulla ratio among different breeds. The results suggest that some morphological properties of the radius of toy Poodles and Pomeranians, namely cross-sectional area, cross-sectional moments of inertia, cross-sectional shape and cortical thicknesses, may contribute to their higher fracture rate than the Maltese dogs.
Subjects
toy breeds
geometrical parameter
radius
fracture
Type
thesis
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