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首页> 外文期刊>Journal of Biomechanics >Differences in lower limb transverse plane joint moments during gait when expressed in two alternative reference frames
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Differences in lower limb transverse plane joint moments during gait when expressed in two alternative reference frames

机译：用两个备选参考系表示时步态下肢横断面关节力矩的差异

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摘要

When comparing previous studies that have measured the three-dimensional moments acting about the lower limb joints (either external moments or opposing internal joint moments) during able-bodied adult gait, significant variation is apparent in the profiles of the reported transverse plane moments. This variation cannot be explained on the basis of adopted convention (i.e. external versus internal joint moment) or inherent variability in gait strategies. The aim of the current study was to determine whether in fact the frame in which moments are expressed has a dominant effect upon transverse plane moments and thus provides a valid explanation for the observed inconsistency in the literature. Kinematic and ground reaction force data were acquired from nine able-bodied adult subjects walking at a self-selected speed. Three-dimensional hip, knee and ankle joint moments during gait were calculated using a standard inverse dynamics approach. In addition to calculating internal joint moments, the components of the external moment occurring in the transverse plane at each of the lower limb joints were calculated to determine their independent effects. All moments were expressed in both the laboratory frame (LF) as well as the anatomical frame (AF) of the distal segment. With the exception of the ankle rotation moment in the foot AF, lower limb transverse plane joint moments during gait were found to display characteristic profiles that were consistent across subjects. Furthermore, lower limb transverse plane joint moments during gait differed when expressed in the distal segment AF compared to the LF. At the hip, the two alternative reference frames produced near reciprocal joint moment profiles. The components of the external moment revealed that the external ground reaction force moment was primarily responsible for this result. Lower limb transverse plane joint moments during gait were therefore found to be highly sensitive to a change in reference frame. These findings indicate that the different transverse plane joint moment profiles during able-bodied adult gait reported in the literature are likely to be explained on this basis. (c) 2006 Elsevier Ltd. All rights reserved.
机译：比较以前的研究，这些研究测量了健全成人步态中作用于下肢关节的三维力矩（外部力矩或相对的内部关节力矩），在所报告的横向力矩中有明显的变化。无法根据采用的惯例（即外部关节力矩与内部关节力矩）或步态策略的固有变化来解释这种变化。当前研究的目的是确定实际上表达力矩的框架是否对横向力矩有显着影响，从而为文献中观察到的不一致提供了有效的解释。运动和地面反作用力数据是从九名身体健康的成年受试者中以自选速度行走的。使用标准的逆动力学方法计算了步态中髋，膝和踝关节的三维力矩。除了计算内部关节力矩外，还计算每个下肢关节在横向平面中出现的外部力矩分量，以确定它们的独立作用。所有力矩均在远端节段的实验室框架（LF）和解剖框架（AF）中表示。除了脚部AF的踝关节旋转力矩外，步态中的下肢横向平面关节力矩显示出在受试者之间一致的特征曲线。此外，步态下肢横断面关节力矩在远端节段AF中表达与LF相比有所不同。在臀部，两个可替代的参考系产生了接近相互的关节力矩曲线。外部力矩的分量表明，外部地面反作用力力矩是造成这一结果的主要原因。因此，发现步态下肢横断面关节力矩对参考系的变化高度敏感。这些发现表明，文献中报道的健壮成人步态期间不同的横断面关节力矩曲线很可能是在此基础上解释的。 （c）2006 Elsevier Ltd.保留所有权利。

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