...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Biomechanics >Validation of vibration testing for the assessment of the mechanical properties of human lumbar motion segments
【24h】

Validation of vibration testing for the assessment of the mechanical properties of human lumbar motion segments

机译：验证振动测试以评估人体腰椎运动段的机械性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Experimental modal analysis is a non-destructive measurement technique, which applies low forces and small deformations to assess the integrity of a structure. It is therefore a promising method to study the mechanical properties of the spine in vivo. Previously, modal parameters successfully revealed artificially induced spinal injuries. The question remains however, whether experimental modal analysis can be applied successfully in human spinal segments with mechanical changes due to physiological processes. Since quasi-static mechanical testing is considered the "gold standard" for assessing intervertebral stiffness, the purpose of our study was to examine if the mechanical properties derived from vibration testing and quasi-static testing correlate.Six cadaver human spines (L1-L5) were loaded quasi-statically in bending and torsion, while an optical system measured the angular rotations of the individual motion segments. Subsequently, the polysegmental spines were divided into L2-L3 and L4-L5 segments and a shaker was used to vibrate the upper vertebra, while its response was obtained from accelerometers in anteroposterior and mediolateral directions. From the resulting frequency response function the eigenfrequencies (ratio between stiffness and mass) and vibration modes (pattern of motion) were determined.The vibration results showed clear eigenfrequencies for flexion-extension (mean 121.83. Hz, SD 40.05. Hz), lateroflexion (mean 132.17, SD 34.80. Hz) and axial rotation (mean 236.17. Hz, SD 81.45. Hz). Furthermore, the correlation between static and dynamic tests was significant (r=0.73, p=0.01). In conclusion, the findings from this study show that experimental modal analysis is a valid method to assess the mechanical properties of human lumbar motion segments.
机译：实验模态分析是一种非破坏性的测量技术，它可以施加较小的力和较小的变形来评估结构的完整性。因此，在体内研究脊柱的机械性能是一种很有前途的方法。以前，模态参数成功地揭示了人为诱发的脊髓损伤。然而，问题是，实验模态分析能否成功地应用于由于生理过程而发生机械变化的人体脊柱节段。由于准静态机械测试被认为是评估椎间僵硬的“金标准”，因此我们的研究目的是检查源自振动测试和准静态测试的机械性能是否相关。六具尸体人脊椎（L1-L5）光学系统测量弯曲和扭转时的准静态载荷，而光学系统则测量各个运动段的角旋转。随后，将多节棘分为L2-L3和L4-L5段，并使用振动器振动上椎骨，而其响应是通过前后左右方向的加速度计获得的。根据得到的频率响应函数确定本征频率（刚度与质量之比）和振动模式（运动模式），振动结果显示出屈伸的平均频率（平均121.83.Hz，SD 40.05.Hz），后屈（平均值132.17，SD 34.80。Hz）和轴向旋转（平均值236.17。Hz，SD 81.45。Hz）。此外，静态测试和动态测试之间的相关性也很显着（r = 0.73，p = 0.01）。总之，这项研究的结果表明，实验模态分析是评估人体腰椎运动节段力学性能的有效方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号