【摘要】 背景:骨质疏松、骨重建、骨再造等都需要了解青年和老年尸体肋骨的弯曲力学特性。以往的研究多以单独青年尸体或单独老年尸体肋骨为观察对象,而有关青年和老年尸体肋骨弯曲力学特性的研究报道极少。目的:对正常国人青年和老年新鲜尸体肋骨进行弯曲实验,分析肋骨的弯曲力学性质,确定老年尸体肋骨和青年尸体肋骨是否具有不同的弯曲力学性质。方法:实验标本取自4具正常国人男性新鲜尸体,年龄分别为20,25,70,75岁,由白求恩医科大学解剖教研室提供。人死亡后1h之内解剖取出死者肋骨标本,将标本沿纵向切成长45mm的试样。以三点弯曲的方法进行弯曲实验,检测肋骨最大载荷、弯矩、应力、应变及宏观断口形貌。结果与结论:青年组肋骨最大载荷、最大弯矩、最大应力、最大应变均显著大于老年组(P<0.05)。肋骨弯曲断口多数为横断口,少数为斜断口。青年组肋骨骨皮质较厚,老年组肋骨骨皮质较薄,呈现出骨质疏松形态,提示青年组肋骨和老年组肋骨具有不同的弯曲力学特性,老年组试样由于骨质疏松导致弯曲力学特性发生改变。更多还原

【Abstract】 BACKGROUND:Impact mechanics properties of ribs should be understood in treating osteoporosis,bone remodeling,as well as bone reconstruction.Most of previous studies concerning youth and the elderly corpses alone,reports regarding bending of ribs mechanical properties are few.OBJECTIVE:To perform bending experiment to the normal people youth and the elderly fresh corpse ribs to survey the bending mechanical properties,and to definite whether the bending mechanical properties of ribs have difference between youth and the elderly people.METHODS:Experimental samples were obtained from 4 normal fresh corpses,aged 20,25,70 and 75 years,were provided by Department of Anatomy,Norman Bethune Medical University.Spinal column ribs specimen were obtained from corpse within 1 hour and cut into 45 mm long pieces.By the method of three-point bending test,data about maximum load,bending moment,stress,strain and the morphology of fracture surface was observed.RESULTS AND CONCLUSION:The maximum load,maximum bending moment,maximum stress,and maximum strain of the youth group were all obviously greater than that of the elderly group(P < 0.05).The majority of ribs fracture was transverse bending test port,a few was oblique fracture.The macroscopic observation showed that the ribs of the youth group cortical bone were thick,and ribs of the elderly group were thinner.It demonstrated that the bending mechanics properties of ribs are different between the youth and elderly groups,and osteoporosis changes bending mechanics properties in the elderly people.更多还原