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首页> 外文期刊>Journal of Biomechanics >DETERMINATION OF SPINAL FACET JOINT LOADS FROM EXTRA-ARTICULAR STRAINS - A THEORETICAL VALIDATION
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DETERMINATION OF SPINAL FACET JOINT LOADS FROM EXTRA-ARTICULAR STRAINS - A THEORETICAL VALIDATION

机译：从关节外拉力确定脊髓面部关节的载荷-理论验证

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Loads on the facet joints of the lumbar spine may play a role in low back pain. Abnormal loading of the Facets, either primarily or as a consequence of disc degeneration, may accelerate their degeneration. Study of these phenomena is difficult, since there are few methods for a direct measure of facet forces occurring in vivo. The authors developed a method for the direct measure of facet forces in a canine animal model of spine disease using strain gages. The method used empirical calibration of the strain gages, which was used to reduce experimental strain output to facet force during function. In this Technical Note, a theoretical model is formulated, solved and validated which gives a theoretical basis for the data reduction method. The facet is modeled as a cantilevered plate and deformations, as function of applied normal load, solved for using a finite difference method. The model is validated by comparison with two experiments with strain-gaged facets. Results from the model show that a minimum of three strain gages is required to determine uniquely the location and magnitude of an applied load to the facet, and that at least two gages should be placed in the region where the cranial articular process joins the pedicle with the gage axis parallel to that of the process. Plate surface strains were found to be insensitive to changes in the area of the applied loads, for a given resultant force magnitude. The method may be useful in other applications in which resultant force magnitude and location need to be measured on plate-like structures. (C) 1996 Elsevier Science Ltd. [References: 11]
机译：腰椎小关节上的负荷可能在下腰痛中起作用。小平面的异常加载（主要是由于椎间盘退变或由于椎间盘退变而导致）可能会加速其退变。这些现象的研究很困难，因为很少有方法可以直接测量体内发生的小平面力。作者开发了一种使用应变片直接测量脊柱疾病犬动物模型中小平面力的方法。该方法使用了应变计的经验标定，该标定用于减少实验过程中输出的应变到小平面力的作用。在本技术说明中，公式化，求解和验证了理论模型，为数据缩减方法提供了理论基础。该小面被建模为悬臂板，并且变形是所施加法向载荷的函数，可以使用有限差分法求解。该模型通过与两个带有应变片刻面的实验进行比较来验证。该模型的结果表明，至少需要三个应变计才能唯一确定施加到小平面的载荷的位置和大小，并且至少两个应变计应放置在颅骨关节突连接椎弓根的区域中。量规轴与过程的轴平行。对于给定的合力大小，发现板表面应变对所施加载荷区域的变化不敏感。该方法在其他需要在板状结构上测量合力大小和位置的应用中可能有用。 （C）1996 Elsevier Science Ltd. [参考：11]

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