Site-specific adaptive remodeling of Greyhound metacarpal cortical bone subjected to asymmetrical cyclic loading

American Journal of Veterinary Research
K A JohnsonP Muir

Abstract

To quantify geometric, inertial, and histomorphometric properties at the mid-diaphyseal level of left and right metacarpal bones (MCB) of racing Greyhounds. MCB from 7 racing Greyhounds euthanatized for reasons unrelated to MCB abnormalities. Mid-diaphyseal transverse sections of left and right MCB were stained with H&E or microradiographed. Images of stained sections were digitized, and cross-sectional area, cortical area, and maximum and minimum area moments of inertia of each bone were determined. Histomorphometric data (osteonal density, osteonal birefringence, and endosteal new lamellar bone thickness) were collected in 4 quadrants (dorsal, palmar, lateral, medial). Values were compared between limbs and among bones and quadrants. Cross-sectional area, cortical area, and maximum and minimum moments of inertia of left MCB-IV and -V were significantly greater, compared with contralateral bones. Overall osteonal densities in the dorsal quadrants of left MCB were greater, compared with lateral and medial quadrants. Also, percentage of birefringent osteons was significantly greater in the dorsal quadrant of left MCB-III, -IV, and -V, compared with the palmar quadrant. Thickness of new endosteal lamellar bone was not significant...Continue Reading

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Citations

May 1, 2013·American Journal of Veterinary Research·Wade T WalkerAshley E Hill
Mar 6, 2013·Veterinary and Comparative Orthopaedics and Traumatology : V.C.O.T·P J DelisserN J Burton
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May 10, 2020·Animals : an Open Access Journal From MDPI·Anna L PalmerChris W Rogers

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