中国组织工程研究

中国组织工程研究 ›› 2010, Vol. 14 ›› Issue (9): 1595-1598.doi: 10.3969/j.issn.1673-8225.2010.09.017

• 骨与关节损伤基础实验 • 上一篇    下一篇

老龄腰椎松质骨的剪切力学变化

吕雅平1，李云鹤2，刘轶凡2，马洪顺3   

  1. 1大庆石油学院机械科学与工程学院，黑龙江省大庆市 163318；
    2中国石油大庆石化公司化工一厂，黑龙江省大庆市  163318；
    3吉林大学南岭校区工程力学系，吉林省长春市  130022
  • 出版日期:2010-02-26 发布日期:2010-02-26
  • 作者简介:吕雅平，女，1963年生，黑龙江省大庆市人，1987年大庆石油学院毕业，讲师，主要从事实验力学与生物力学的研究。 mahs@jlu.edu.cn

Shear mechanical properties of lumbar trabecular bone in aged people

Lü Ya-ping1, Li Yun-he2, Liu Yi-fan2, Ma Hong-shun3   

  1. 1Mechanical Science and Engineering College of Daqing Petroleum Institute, Daqing  163318, Heilongjiang Province, China; 2First Chemical Factory of China Petroleum Daqing Petrochemical Company, Daqing  163318, Heilongjiang Province, China; 3Department of Engineering Mechanics, Nanling Campus of Jilin University, Changchun  130022, Jilin Province, China
  • Online:2010-02-26 Published:2010-02-26
  • About author:Lü Ya-ping, Lecturer, Mechanical Science and Engineering College of Daqing Petroleum Institute, Daqing 163318, Heilongjiang Province, China mahs@jlu.edu.cn

PDF

402

被引次数

8

摘要：

背景：骨质疏松、骨重建、骨再造、腰椎骨折固定器械的选择等都需要了解青年尸体和老年尸体腰椎松质骨的剪切力学特性。

目的：比较老年尸体松质骨和青年尸体腰椎松质骨是否具有不同的剪切力学性质。

方法：实验标本取自正常国人新鲜尸体4具，由白求恩医科大学解剖教研室提供，年龄分别为22，28，70，75岁。人死亡后1 h之内，解剖尸体取出腰段脊柱L2~L5标本。将标本沿前、后、左、右纵向切成长40 mm，宽5 mm，高5 mm的试样，在电子万能试验机上进行实验，以5 mm/min的实验速度对试样施加剪切力，实验结束后，打印机自动打印出剪切力、应变剪切应力等数据。观察每个试样的宏观断口形貌。

结果与结论：剪切试样破坏后分别对两组试样的破坏断口进行大体观察发现，多数为横断口，少数为斜断口，青年组腰椎松质骨骨小梁排列细密，老年组腰椎松质骨骨小梁排列稀疏，孔隙较大。青年组剪切力、剪切应力和应变均显著高于老年组[(37.19±3.25)，(28.34±3.42)N；(1.49±0.13)，(1.13±0.14)MPa；(1.40±0.50)%，(0.90±0.20)%，P < 0.05]。提示青年组脊柱腰椎松质骨和老年组脊柱腰椎松质骨具有不同的剪切力学特性。

关键词: 老年人尸体, 脊柱, 青年人尸体, 腰椎松质骨, 剪切力, 剪切应力, 剪切应变, 骨力学

Abstract:

BACKGROUND: Shear mechanical properties of lumbar trabecular bone should be understood in treating osteoporosis, bone remodeling, bone reconstruction, as well as the choice of fracture fixed equipment.

OBJECTIVE: To explore whether the shear mechanical properties of lumbar trabecular bone is different in young and aged normal fresh cadavers.

METHODS: Experimental samples were from 4 normal fresh corpse, aged 22, 28, 70 and 75 years, were provided by Department of Anatomy, Norman Bethune Medical University. Spinal column thoracic vertebra L2-L5 specimen were obtained from corpse within 1 hour and cut into 40 mm×5 mm×5 mm pieces. The specimen were tested on electronic universal testing machine with speed of 5 mm/min, the shear load, stress, strain and other data would be printed automatically, and the morphology of fracture surface was observed.

RESULTS AND CONCLUSION: Majority of the fracture surfaces were comminuted, minority were transverse or oblique fracture. The macroscopic observation showed that trabecular arranged compact in the thoracic vertebra cancellous bone of the youth group, which was sparse arrangement and presented with senile osteoporosis in the aged group. The shear force, shear stress and strain of the youth group was greater than that of the aged group [(37.19±3.25), (28.34±3.42) N; (1.49±0.13), (1.13±0.14) MPa; (1.40±0.50)%, (0.90±0.20)%, P < 0.05]. It demonstrated that the impact mechanics properties of thoracic vertebra cancellous bone are different between the youth and aged groups.

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