Development of strength index of human bones by using natural frequencies of bones and evaluation of muscle forces

为了评估人体骨骼的质量和强度，通过计算机断层扫描（CT）图像分析计算前臂骨骼和肌肉的横截面积。提出了涉及肌力影响的力学指标，并对其老化性能进行了研究。为了比较骨密度和强度指标，用前臂骨的固有频率计算对应的杨氏模量。所提出的弯曲和压缩指标与骨密度和强度指标相似，随年龄增长呈下降趋势。研究了传感器薄膜的弯曲和压缩性能，揭示了骨骼和肌肉之间的载荷关系，并测量了这些力，从而确定了传感器的用途。

In order to evaluate the quality and strength of human bones, cross sectional areas of bones and muscles of forearm were calculated from computed tomography (CT) image analysis. Then mechanical indexes involving the effect of muscle forces were proposed and the aging porperty was investigated. For comparison the bone mineral density and the strength index by using natural frequency of forearm bones corresponding to Young's modulus were calculated. The proposed indexes with respect to bending and compression showed the tendency to decrease with aging similarly to the bone mineral density and the strength index. Bending and compression properties of thin films of sensors were investigated for revealing the loading relationship between bones and muscle force and measuring those forces, and then the usage as a force sensor was ascertained.