Nunamaker D M, Butterweck D M, Provost M T
New Bolton Center, University of Pennsylvania School of Veterinary Medicine, Kennett Square 19348.
J Biomech. 1989;22(2):129-34. doi: 10.1016/0021-9290(89)90035-3.
Geometric properties of the third metacarpal bone were compared between the young and adult Standardbred and Thoroughbred racehorse. The change in shape during growth and superimposed training was dramatic in both breeds but the Thoroughbred showed the greatest difference in the minimum moment of inertia as the animal matured. Males had larger moments of inertia throughout the length of the diaphysis than did females. The differences in geometric properties of the third metacarpal bone between the Thoroughbred and Standardbred were related to the incidence of fatigue fractures which are common in the racing Thoroughbred but uncommon in the Standardbred racehorse.
对年轻和成年的标准赛马及纯种赛马的第三掌骨的几何特性进行了比较。在两个品种中，生长和叠加训练期间形状的变化都很显著，但随着动物成熟，纯种赛马在最小惯性矩方面表现出最大差异。在骨干全长上，雄性的惯性矩比雌性大。纯种赛马和标准赛马第三掌骨几何特性的差异与疲劳骨折的发生率有关，疲劳骨折在纯种赛马比赛中很常见，而在标准赛马中不常见。
