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首页> 外文期刊>Journal of Biomechanics >Predicting fracture of the femoral neck.
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Predicting fracture of the femoral neck.

机译：预测股骨颈骨折。

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摘要

A prediction of the probability of safe loading of the femoral neck, based on queueing theory, is presented. The following methods have been applied: (I) criterion of bone fracture was formulated, taking into consideration the complex state of stress-strain in the porosity zones of the bone; (II) tensile stresses around pores in the stretched zone of the bone were evaluated; (III) the influence of random events of the critical regimes of loading was modeled. The evaluation of the probability of safe loading of bones was obtained based on the levels of the tensile stresses, Young's moduli and ultimate tensile stresses which are affected by the increase in bone porosity and the distribution of the pores. Examples of analysis involving typical mechanical properties of bone in areas of vascular and lacunar-canalicular porosity are demonstrated. The ranges of initial average values of effective Young's moduli and ultimate tensile strengths were taken as 15.8-17.5GPa and 83-95MPa, respectively. The present analysis discovers the existence of three levels of safe loading: (1) a relatively safe level of the nominal tensile stresses (smaller than (2.8-3.2)MPa) where the probability of safe loading is of the order of 0.95 for the bone porosity which is less than 0.15; (2) an intermediate level of safety where the nominal tensile stresses are below (4.2-4.8)MPa and the probability of safe loading is 0.89 or higher, for the same level of bone porosity; (3) a critical level of safe loading where the nominal tensile stresses are about (8.3-9.5)MPa; they lead to sharp drop of probabilities of safe loading to 0.85-0.8 if the porosity is about 0.10 and to probabilities of 0.41-0.4 if the porosity is about 0.15.
机译：提出了一种基于排队论的股骨颈安全负载概率的预测方法。应用了以下方法：（I）考虑到骨孔隙区域中应力应变的复杂状态，制定了骨折准则。 （II）评估骨的拉伸区域中的孔周围的拉伸应力; （III）模拟了随机事件对关键载荷制度的影响。根据受骨孔隙度增加和孔分布影响的拉伸应力，杨氏模量和极限拉伸应力的水平，对骨骼进行安全加载的可能性进行了评估。演示了涉及血管和腔隙-小管孔隙率区域的典型骨力学特性的分析实例。有效杨氏模量的初始平均值的范围和极限抗拉强度的范围分别为15.8-17.5GPa和83-95MPa。本分析发现存在三个安全载荷水平：（1）相对安全的名义拉伸应力水平（小于（2.8-3.2）MPa），其中骨骼的安全载荷概率约为0.95孔隙率小于0.15; （2）在同等骨质疏松度的情况下，中间安全等级，其名义拉伸应力低于（4.2-4.8）MPa，安全载荷的概率为0.89或更高; （3）额定拉应力约为（8.3-9.5）MPa的临界安全载荷水平;如果孔隙率大约为0.10，则导致安全载荷的概率急剧下降至0.85-0.8;如果孔隙率约为0.15，则导致0.41-0.4的概率。

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