Lee M, Liversidge K
Faculty of Health Sciences, University of Sydney, Australia.
J Manipulative Physiol Ther. 1994 Oct;17(8):511-6.
One commonly used clinical procedure involves the assessment of stiffness during the application of a posteroanterior force to the spinous process of a vertebra. The clinician commonly applies a force normal to the sagittal spinal curve and attempts to evaluate whether the stiffness of the response is also normal. The purpose of this study was to determine whether the stiffness of posteroanterior movements in normal subjects significantly differed when the force was applied to L3, L4 or L5 and when the rate of application changed from quasistatic to cyclical loading.
Experimental investigation of characteristics of normal subjects.
University biomechanics laboratory.
None.
Posteroanterior stiffness at L3, L4 and L5 during quasistatic and cyclical loading.
The posteroanterior response was found to be stiffest at L5, least at L3 and intermediate at L4. Quasistatic loading produced lower stiffness than cyclical loading at .5 Hz.
The clinical assessment of the low lumbar spine through manual loading requires a knowledge of the likely variations of posteroanterior stiffness. This study has established that in normal subjects there are systematic effects due to the location of load and the rate of loading.
一种常用的临床操作是在对椎体棘突施加前后向力时评估其刚度。临床医生通常施加一个垂直于脊柱矢状曲线的力，并试图评估反应的刚度是否也正常。本研究的目的是确定在正常受试者中，当力施加于L3、L4或L5时，以及施加速率从准静态变为周期性加载时，前后向运动的刚度是否存在显著差异。
对正常受试者特征的实验研究。
大学的生物力学实验室。
无。
准静态和周期性加载过程中L3、L4和L5的前后向刚度。
发现前后向反应在L5处最硬，在L3处最软，在L4处居中。在0.5Hz时，准静态加载产生的刚度低于周期性加载。
通过手动加载对下腰椎进行临床评估需要了解前后向刚度的可能变化。本研究表明，在正常受试者中，由于加载位置和加载速率的不同会产生系统性影响。
