Yeni Y N, Brown C U, Norman T L
Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, USA.
Bone. 1998 Jan;22(1):79-84. doi: 10.1016/s8756-3282(97)00227-5.
The influence of wet and dry apparent density, apparent and real percentage of mineral, organic and water contents on the tension and shear fracture toughness, i.e., the mode I and mode II strain energy release rate (GIc and GIIc), respectively, was investigated for the human femur and the tibia. The results suggest that the water content, apparent density, and age were the best explanatory parameters for GIc and GIIc. Both GIc and GIIc significantly increase with increasing wet or dry apparent density. They also decrease with increasing water content; the decrease is nonsignificant for GIIc in the femur only. Mineral and organic percentage did not change in the bone with age, while the apparent percentages did change. Compositional parameters altogether can explain 35%-59% of the variation in fracture toughness. We conclude that bone composition and density have an important influence on fracture resistance of the cortical bone.
研究了人股骨和胫骨的湿表观密度、干表观密度、矿物质、有机物和水含量的表观百分比及实际百分比对拉伸和剪切断裂韧性（即分别对应I型和II型应变能释放率G(_I)c和G(_II)c）的影响。结果表明，水含量、表观密度和年龄是G(_I)c和G(_II)c的最佳解释参数。G(_I)c和G(_II)c均随湿表观密度或干表观密度的增加而显著增加。它们也随水含量的增加而降低；仅股骨中G(_II)c的降低不显著。随着年龄增长，骨中矿物质和有机物的百分比没有变化，而表观百分比有变化。成分参数总共可解释断裂韧性变化的35%-59%。我们得出结论，骨成分和密度对皮质骨的抗骨折能力有重要影响。
