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Supraphysiologic glucocorticoid administration increased biomechanical bone strength of rats’ vertebral body


The aim of this study is to assess the effects of different glucocorticoid administration protocols on biomechanical properties of the first lumbar vertebral body in rats. We divided 40 male rats into the following groups: control, dexamethasone (7 mg/week), dexamethasone (0.7 mg/week), methylprednisolone (7 mg/kg/week), methylprednisolone (5 mg/kg twice weekly), dexamethasone (7 mg/kg three times per week), dexamethasone (0.7 mg/kg three times per week, and low-level laser treated rats. Lumbar vertebrae in rats were exposed to the pulsed laser. We conducted a biomechanical test to examine the mechanical properties of vertebral body in rats’ lumbar bone. Supraphysiologic glucocorticoid administration protocols did not impair the biomechanical properties of rats’ vertebral bodies compared to control and laser-treated rats. Supraphysiologic glucocorticoid administration caused an anabolic effect on the vertebral bodies.


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Correspondence to Mohammad Bayat.

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Najar, A., Fridoni, M., Rezaei, F. et al. Supraphysiologic glucocorticoid administration increased biomechanical bone strength of rats’ vertebral body. Lab Anim Res 31, 180–187 (2015).

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  • Glucocorticoid administration
  • biomechanical properties
  • rat
  • cancellous bone
  • low-level laser therapy