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Aging effect on the mechanical properties and bone density of the rat cervical and lumber spine were evaluated from young to old specimens. The dynamic viscoelastic properties were measured by a viscoelastic spectrometer. The static test was performed with an Instron-type universal testing machine. We examined dynamic stiffness, tanδ, fracture load, ultimate strength, and deformation energy of the cervical and lumber spine over several period of the time. Bone mineral content was measured by dual X-ray absorptiometry at the femoral diaphysis, femoral distal and lumber 3(L3). The dynamic stiffness and tanδ without the soft tissue around lumber spine indicated a second order polynomial function of age, but cervical spine showed no clear trend with age. Fracture load of the cervical and lumber spine indicated a second order polynomial function of age. We also found linear relations between the mechanical properties and density of bone.

Variation in Mechanical Properties of Rat Vertebrae with Age and Their Relation to Bone Density.