Fathallah F A, Marras W S, Parnianpour M, Granata K P
Biodynamics Laboratory, Ohio State University, Columbus, USA.
J Biomech. 1997 Sep;30(9):975-8. doi: 10.1016/s0021-9290(97)00055-9.
Biomechanical lifting models often require the knowledge of the applied trunk moments and forces for model validation purposes and/or to determine loading levels experienced at various joints of the body. Trunk kinetic data under dynamic exertions are commonly difficult to attain without restrictive anatomic/anthropometric assumptions and cost or constraining body motion. The main objectives of the study were to present a new technique for determining continuous three-dimensional forces and moments about the L5/S1 spinal joint, and to validate the technique and assess its applicability under lifting situations. A combination of a force plate and two electrogoniometers facilitated the determination of trunk kinetics about L5/S1. An apparatus was devised to allow the application of various actual moments that were compared to their corresponding predicted moments. The results showed that, over all the conditions considered, the average percent error in estimating the actual applied moment(s) was about 4% (2.3 S.D.), with a test-retest reliability approaching unity. Given such agreement, along with the relative ease and directness of the method, it is believed that this approach should be applicable under most lifting conditions. The technique offers a fairly accurate measure of trunk moments without the need for constraining the motion of any body joint.
生物力学提升模型通常需要了解所施加的躯干力矩和力，以便进行模型验证和/或确定身体各个关节所承受的负荷水平。在没有限制性解剖学/人体测量学假设以及成本或限制身体运动的情况下，动态用力时的躯干动力学数据通常很难获得。本研究的主要目的是提出一种确定L5/S1脊柱关节周围连续三维力和力矩的新技术，并验证该技术并评估其在提升情况下的适用性。力板和两个电子测角仪的组合有助于确定L5/S1周围的躯干动力学。设计了一种装置，以允许施加各种实际力矩，并将其与相应的预测力矩进行比较。结果表明，在所有考虑的条件下，估计实际施加力矩的平均百分比误差约为4%（标准差为2.3），重测信度接近1。鉴于这种一致性，以及该方法相对简便直接，相信这种方法在大多数提升条件下都应适用。该技术无需限制任何身体关节的运动，就能相当准确地测量躯干力矩。
