马第三掌骨的材料特性分布有助于增强矢状面弯曲。

The distribution of material properties in the equine third metacarpal bone serves to enhance sagittal bending.

作者信息

Les C M, Stover S M, Keyak J H, Taylor K T, Willits N H

机构信息

Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California, Davis 95616-8732, USA.

出版信息

J Biomech. 1997 Apr;30(4):355-61. doi: 10.1016/s0021-9290(96)00157-1.

DOI:10.1016/s0021-9290(96)00157-1

PMID:9075003

Abstract

The distribution of material properties within the equine third metacarpal bone (MC3), and its possible effect on the mechanics of the structure, was quantitatively evaluated using single-load-to-failure compressive materials testing of specimens from ten horses. Bone samples from six regions within five proximodistal levels of MC3 were milled into right cylinders and compressed at a strain rate of 0.01 s-1. Diaphyseal MC3 bone material was stiffer, stronger, deformed less to yield and failure, and absorbed more energy to yield, than metaphyseal cortical bone material. Lateral and medial MC3 cortical bone material was stiffer and deformed less to yield and failure, than dorsal and palmar material. This distribution of material properties appears to increase the structural compliance in the sagittal plane, and may serve to enhance the predictability of the strain distribution during normal locomotion, as is provided in other bones by a sagittal curvature.

摘要

通过对十匹马的标本进行单载荷至破坏压缩材料测试，定量评估了马第三掌骨（MC3）内材料特性的分布及其对结构力学的可能影响。从MC3五个近远侧水平的六个区域采集的骨样本被研磨成右圆柱体，并以0.01 s-1的应变速率进行压缩。骨干MC3骨材料比干骺端皮质骨材料更硬、更强，屈服和破坏时的变形更小，屈服时吸收的能量更多。MC3外侧和内侧皮质骨材料比背侧和掌侧材料更硬，屈服和破坏时的变形更小。这种材料特性的分布似乎增加了矢状面的结构顺应性，并且可能有助于提高正常运动过程中应变分布的可预测性，就像其他骨骼通过矢状弯曲所提供的那样。