COMPRESSIVE PROPERTIES OF SINGLE OSTEONS
COMPRESSIVE PROPERTIES OF SINGLE OSTEONS
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DOI：
10.1002/ar.1091610309
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发表时间：
1968-01-01
影响因子：
--
通讯作者：
BONUCCI, E
中科院分区：
文献类型：
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作者：
ASCENZI, A;BONUCCI, E
利用配备微波测微仪的微型试验机，在专门制备的试件中研究了单个人骨的抗压强度。得到的主要结论是：(1)与Gebhardt的理论一致，具有横向取向纤维束的骨组织的极限抗压强度最高，具有纵向取向的纤维束组织的骨组织的极限抗压强度最低，纤维束沿连续的薄片方向改变约90°的骨组织的骨组织的极限抗压强度居中。(2)具有横向定向纤维束的骨组织的弹性模量值最大。(3)对于三种类型的骨素，完全钙化的骨素的应力-应变曲线与低钙骨素的应力-应变曲线明显不同，后者的弹性模量值要低得多。(4)年龄对骨小梁的压缩特性似乎没有明显影响。(5)单根骨的压缩性能与宏观骨样的压缩性能的比较似乎支持了骨单位实际上是致密骨的力学单位的观点。(6)骨样的断裂始于剪切引起的微观裂缝。(7)这些裂隙与骨小梁的轴线成约30°~35°的夹角，且与骨小梁的微观结构无明显差异。(8)电子显微镜下可见骨裂边缘骨质晶体变形，胶原纤维断裂。
The compressive strength of single human osteons has been investigated in specially prepared samples using a microtesting machine equipped with a microwave micrometer. The main conclusions which can be drawn from our results are: (1) In agreement with Gebhardt's theories the ultimate compressive strength is greatest for osteons having transversally oriented fiber bundles, lowest for osteons having longitudinally oriented fiber bundles, and intermediate for osteons whose fiber bundles change direction in successive lamellae through an angle of about 90°. (2) The modulus of elasticity is greatest in osteons with transversally oriented fiber bundles. (3) With all three types of osteon the stress‐strain curves for fully calcified osteons are markedly different from those for osteons with low calcium content, the modulus of elasticity being much lower in osteons of the latter type. (4) Age seems to have no measurable influence on the compressive properties of osteons. (5) The comparison of compressive properties in single osteons and in macroscopic bone samples seems to support the view that the osteon is actually the mechanical unit of compact bone. (6) Fracture in osteon samples starts with microscopic fissures induced by shearing. (7) In every case these fissures form an angle of roughly 30°–35° with the axis of the osteon and do not appear to vary with the microscopic osteon structures. (8) Electron microscopy reveals distortion of bone crystals and breaking of collagen fibrils at the edges of the fissures.