Experimental study on axial dynamic impact of rabbit single vertebra
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College of Biomedical Engineering, Taiyuan University of Technology

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    Abstract:

    Objective The dynamic impact failure test of rabbit single vertebra was carried out, and compared with the static compression experiment, the damage mechanism of the axial impact of the vertebral body was studied, and the reference for clinical diagnosis was provided. Methods The voltage waveform diagram of the force sensor and the detailed process of the vertebral impact are obtained by the oscilloscope and high-speed photography through the drop hammer dynamic impact experimental device. Results The mean static load of the thoracic and lumbar spine were 910 N and 947 N respectively; the mean dynamic load of the thoracic and lumbar spine were 1196 N and 1026 N respectively; the mean values of the thoracic and lumbar dynamic load coefficients were 1.37 and 1.08; under the condition of static load, the average stress of thoracic and lumbar spine is 15.28 MPa and 12.51 MPa; under the dynamic load conditions, the average stress of thoracic and lumbar spine is 20.03 MPa and 13.56 MPa; during dynamic impact, the mean value of longitudinal strain and transverse strain is -0.3 and -0.005 (compression); under dynamic conditions, the destruction energy of vertebrae increases from 0 J to 4.4 J. Conclusion Under dynamic and static experimental conditions, the dynamic load of the same vertebral body is greater than the static load; the mean value of the dynamic load coefficient of the thoracic vertebra is larger than that of the lumbar vertebrae; the equivalent stress value of the thoracic vertebra is greater than that of the lumbar vertebrae; The axial strain of vertebra under impact is greater than the transverse strain; the energy growth of the vertebral body presents a first slow and then rapid changing process. This study can provide guidance for the prevention and rehabilitation of human vertebral body injury in clinical practice.

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History
  • Received:October 26,2019
  • Revised:December 17,2019
  • Adopted:December 31,2019
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