List Renate, Hitz Marina, Angst Michael, Taylor William R, Lorenzetti Silvio
Institute for Biomechanics, ETH Zurich, Switzerland.
Institute for Biomechanics, ETH Zurich, Switzerland.
Gait Posture. 2017 Oct;58:98-102. doi: 10.1016/j.gaitpost.2017.07.111. Epub 2017 Jul 21.
Force plates are common assessment tools used in biomechanics to measure ground reaction forces during motion capture or strength exercises. While the accuracy of the resulting kinetic data is critical for accurate gait analysis, factors such as plate mounting are thought to influence the measured point of force application (PFA) of the ground reaction forces. The aim of this study was therefore to present an accurate in-situ PFA calibration method. In addition, the approach was evaluated by examining the required PFA corrections over a period of ten years, which included plate remounting and a change of foundation. The in-situ PFA calibration was performed on six plates by assessing the locations of up to 98 points of force application per plate using an instrumented pole. Application of the in-situ PFA calibration approach reduced the root mean square errors by up to approximately 60% compared to the manufacturers calculation. Correction coefficients were strongly dependent on the individual platform as well as the location of the applied force on the plate. Remounting of the plates altered the plate coefficient corrections considerably, while changes over time were notable but not as extensive. We therefore recommend that plates should be recalibrated after remounting, but also at least every 5 years, in order to ensure the preservation of an accurate PFA.
测力板是生物力学中常用的评估工具，用于在动作捕捉或力量训练期间测量地面反作用力。虽然所得动力学数据的准确性对于准确的步态分析至关重要，但诸如测力板安装等因素被认为会影响地面反作用力的测量力作用点（PFA）。因此，本研究的目的是提出一种精确的原位PFA校准方法。此外，通过检查十年期间所需的PFA校正来评估该方法，这包括测力板重新安装和基础变化。通过使用仪器杆评估每个测力板多达98个力作用点的位置，对六个测力板进行了原位PFA校准。与制造商的计算相比，原位PFA校准方法的均方根误差降低了约60%。校正系数强烈依赖于单个平台以及板上作用力的位置。测力板的重新安装极大地改变了板系数校正，而随时间的变化虽显著但不那么广泛。因此，我们建议在重新安装后以及至少每5年对测力板进行重新校准，以确保保持准确的PFA。
