Chinese Journal of Tissue Engineering Research ›› 2010, Vol. 14 ›› Issue (9): 1595-1598.doi: 10.3969/j.issn.1673-8225.2010.09.017

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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

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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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