Study on Noninvasive Estimate Method for Intervertebral Disk Load at Lumbar Vertebrae
Study on Noninvasive Estimate Method for Intervertebral Disk Load at Lumbar Vertebrae
复制标题
腰椎椎间盘负荷无创估算方法研究
DOI：
10.1299/kikaic.78.2483
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Ryo Fujii
中科院分区：
文献类型：
--
作者：
K. Shibata;Y. Inoue;Y. Iwata;J. Katagawa;Ryo Fujii
当负荷导致腰椎的柔性椎间盘畸形时，就会发生腰痛。测量椎间盘上的载荷的传统方法是侵入式方法，其中通过直接插入电极来测量椎间盘的内部压力。在这项研究中，椎间盘负荷间接得出的非侵入性估计方法，使用三维运动分析系统和信号处理，以估计腰椎的形状。具体估算方法如下。首先，将椎骨假定为刚体。接下来，使用3-D位置坐标用弧来近似腰椎。最后，估计椎间间隙的平均值。因此，由于所提出的方法仅需要将标记物施加到背部的表面并且用相机拍照，因此它是安全的并且不需要外科手术。此外，该方法允许估计运动对象中的椎间盘负荷。在本文中，所提出的方法进行了详细描述。并进行了根据静止姿势估计椎间盘负荷的实验。并与传统方法进行了比较。实验结果表明，该方法是有效的，用该方法估计的椎间盘载荷大小相关趋势与实际测量内压计算的趋势定性一致。
Lumbago occurs when load causes malformation of the flexible intervertebral disks of the lumbar vertebrae. The conventional method of measuring load on the intervertebral disk is an invasive method in which the internal pressure of the intervertebral disk is measured by directly inserting an electrode. In this study, intervertebral disk load is derived indirectly by the noninvasive estimation method that uses three-dimensional motion analysis system and signal processing to estimate the shape of the lumbar vertebrae. Specific estimation method is shown as follows. First, vertebra is assumed to a rigid body. Next, lumbar vertebrae are approximated with an arc using 3-D positional coordinates. Finally, average of the intervertebral gap is estimated. Accordingly, because the proposed method only entails applying markers to the surface of the back and taking pictures with cameras, it is safe and does not require surgical procedures. Furthermore, this method allows estimation of intervertebral disk load in a moving subject. In this paper, the proposed method is described in detail. And an experiment in which intervertebral disk load is estimated from stationary postures is executed. Moreover the proposed method is compared with the conventional method. As a results, the experiment shows that the proposed method is effective in that the magnitude correlation tendencies of intervertebral disk load estimated with the proposed method are qualitatively consistent with the tendencies calculated from actual measurements of internal pressure.