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Assumption of a 'gravity only region' for gravity correction of passive joint moment data may be problematic

机译:假设“仅重力区域”用于被动关节力矩数据的重力校正可能存在问题

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Many devices used to collect joint moment data create gravitational moments due to the masses of the device and the limb being tested. Where a significant gravitational moment is present in the recorded moment-angle data, it may be necessary to correct for (remove) the gravitational moment component.In a recent article in this journal, Anderson et al. (2010) proposed a computationally elegant method for gravity correction of joint moment data. The method relies heavily on the assumption that the joint has a region of near-zero stiffness (the 'gravity-only region') that spans at least 40% of the range of motion. We provide data that demonstrate this assumption is not satisfied, and therefore that the method is not valid, for the human ankle joint. Consequently, we feel that the new method should not be used to remove gravitational moments from human ankle torque-angle data, and should be used with caution for other joints.
机译:由于设备和被测肢的质量,许多用于收集关节力矩数据的设备都会产生重力力矩。如果记录的弯矩角数据中存在显着的重力矩,则可能有必要校正(去除)重力矩分量。在本杂志的最新文章中,Anderson等人。 (2010)提出了一种计算优雅的方法来校正关节力矩数据。该方法在很大程度上取决于以下假设:关节具有接近零的刚度区域(“仅重力区域”),其跨度至少为运动范围的40%。我们提供的数据表明该假设不满足,因此该方法对于人体踝关节无效。因此,我们认为不应使用新方法从人的踝关节扭矩角度数据中去除重力力矩,而应谨慎使用其他关节。

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