Sevil F, Ocal M K
Adnan Menderes University, Veterinary Faculty, Department of Anatomy, Aydin, Turkey.
Dtsch Tierarztl Wochenschr. 2006 Nov;113(11):423-8.
The purpose of this study was to present a detailed description of the cross-sectional geometry at three levels of the metapodial bones and to assess the bone strength from the bone geometry in calf and ox. For this purpose, 20 metapodial bones from five calves and 40 metapodial bones from ten oxen were used. Sections were made at 25, 50 and 75% of the bone length and scanned. The cortical thickness, endosteal and periosteal diameters, cortical and medullar areas as well as second moment of area and section modulus were obtained from the images with the aid of a computer program. The cortical thickness and area values were higher in the metatarsus than that those in the metacarpus. The smallest cortical area and the thinnest cortical thickness were found at the distal level of metapodial bone in both calf and ox. When compared with the calf, relative increases in cortical area were seen at the proximal and distal levels, and the increases in cortical thickness were pronounced in the medial, lateral and dorsal sides in the metacarpus of the ox. With respect to the second moment of area and the polar moment, significant differences between metacarpus and metatarsus were found at the distal half of the bones in the calf while these differences were at the proximal half in the ox. The results of the current study indicated that there were important differences between the metacarpus and metatarsus as well as between the levels of the same bone with regard to the values of the geometric and strength parameters.
本研究的目的是详细描述掌骨和跖骨三个水平的横截面几何形状，并根据小牛和公牛的骨骼几何形状评估骨骼强度。为此，使用了来自五头小牛的20根掌骨和跖骨以及来自十头公牛的40根掌骨和跖骨。在骨骼长度的25%、50%和75%处进行切片并扫描。借助计算机程序从图像中获取皮质厚度、骨内膜和骨膜直径、皮质和髓腔面积以及面积惯性矩和截面模量。跖骨的皮质厚度和面积值高于掌骨。在小牛和公牛的掌骨远端水平发现最小的皮质面积和最薄的皮质厚度。与小牛相比，在近端和远端水平观察到皮质面积相对增加，并且在公牛掌骨的内侧、外侧和背侧皮质厚度增加明显。关于面积惯性矩和极惯性矩，在小牛骨骼的远端一半处掌骨和跖骨之间存在显著差异，而在公牛中这些差异出现在近端一半处。本研究结果表明，掌骨和跖骨之间以及同一骨骼不同水平之间在几何和强度参数值方面存在重要差异。
