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Morphometric Study of the Equine Navicular Bone: Variations with Breeds and Types of Horse and Influence of Exercise
Gabriel, Annick; Jolly, Sandra; Detilleux, Johann et al.
1998In Journal of Anatomy, 193 ((Pt 4)), p. 535-49
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Abstract :
[en] Navicular bones from the 4 limbs of 95 horses, classified in 9 categories, were studied. The anatomical bases were established for the morphometry of the navicular bone and its variations according to the category of horse, after corrections were made for front or rear limb, sex, weight, size and age. In ponies, navicular bone measurements were smallest for light ponies and regularly increased with body size, but in horses, navicular bone dimensions were smallest for the athletic halfbred, intermediate for draft horse, thoroughbreds and sedentary halfbreds and largest for heavy halfbreds. The athletic halfbred thus showed reduced bone dimensions when compared with other horse types. Navicular bones from 61 horses were studied histomorphometrically. Light horses and ponies possessed larger amounts of cancellous bone and less cortical bone. Draft horses and heavy ponies showed marked thickening of cortical bone with minimum intracortical porosity, and a decrease in marrow spaces associated with more trabecular bone. Two distinct zones were observed for the flexor surface cortex: an external zone composed mainly of poorly remodelled lamellar bone, disposed in a distoproximal oblique direction, and an internal zone composed mainly of secondary bone, with a lateromedial direction for haversian canals. Flexor cortex external zone tended to be smaller for heavy ponies than for the light ponies. It was the opposite for horses, with the largest amount of external zone registered for draft horses. In athletic horses, we observed an increase in the amount of cortical bone at the expense of cancellous bone which could be the result of reduced resorption and increased formation at the corticoendosteal junction. Cancellous bone was reduced for the athletic horses but the number of trabeculae and their specific surfaces were larger. Increased bone formation and reduced resorption could also account for these differences.
Disciplines :
Anatomy (cytology, histology, embryology...) & physiology
Author, co-author :
Gabriel, Annick ;  Université de Liège - ULiège > Département de morphologie et pathologie > Anatomie des animaux domestiques
Jolly, Sandra ;  Université de Liège - ULiège > Département de morphologie et pathologie > Pathologie générale et autopsies
Detilleux, Johann ;  Université de Liège - ULiège > Département de productions animales > Génétique quantitative
Dessy, Cécile 
Collin, Bernard ;  Université de Liège - ULiège > Département de morphologie et pathologie > Département de morphologie et pathologie
Reginster, Jean-Yves  ;  Université de Liège - ULiège > Département des sciences de la santé publique > Epidémiologie et santé publique
Language :
English
Title :
Morphometric Study of the Equine Navicular Bone: Variations with Breeds and Types of Horse and Influence of Exercise
Publication date :
November 1998
Journal title :
Journal of Anatomy
ISSN :
0021-8782
eISSN :
1469-7580
Publisher :
Blackwell, Oxford, United Kingdom
Volume :
193
Issue :
(Pt 4)
Pages :
535-49
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 March 2009

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