Reachable Workspace and Proximal Function Measures for Quantifying Upper Limb Motion
Reachable Workspace and Proximal Function Measures for Quantifying Upper Limb Motion
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DOI：
10.1109/jbhi.2020.2989722
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发表时间：
2020-11-01
影响因子：
7.7
通讯作者：
Lotz, Jeffrey
中科院分区：
文献类型：
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作者：
Matthew, Robert P.;Seko, Sarah;Lotz, Jeffrey
缺乏临床评估上肢功能的定量措施。由于硬件成本和复杂性，传统的生物力学性能测量仅限于专业实验室，而最终的测量结果需要专家进行分析。深度相机是低成本的便携式系统，可以跟踪替代关节位置。然而，这些运动在生物学上可能不一致，这可能会导致嘈杂、不准确的运动。本文介绍了一种刚体建模方法，以增强恢复运动的生物学可行性。该方法在现有的深度相机评估上进行评估：用于评估总肩部功能的可达工作空间（RW）测量。当使用刚体模型时，可以添加新的近端目标的位置估计，从而产生用于评估受试者触摸特定身体地标的能力的近端功能（PF）测量。这些措施的准确性和可重复性是在十名无症状受试者（有或没有刚性身体限制）上进行评估的。该分析是在低成本深度相机系统和黄金标准主动运动捕捉系统上执行的。研究发现，添加刚体约束可以提高深度相机系统的准确性和一致性，特别是在横向伸展运动中。 RW 和 PF 测量结果都被认为是临床评估的可行候选者，未来需要进行分析以确定它们检测特定患者群体中变化的能力。
There are a lack of quantitative measures for clinically assessing upper limb function. Conventional biomechanical performance measures are restricted to specialist labs due to hardware cost and complexity, while the resulting measurements require specialists for analysis. Depth cameras are low cost and portable systems that can track surrogate joint positions. However, these motions may not be biologically consistent, which can result in noisy, inaccurate movements. This paper introduces a rigid body modelling method to enforce biological feasibility of the recovered motions. This method is evaluated on an existing depth camera assessment: the reachable workspace (RW) measure for assessing gross shoulder function. As a rigid body model is used, position estimates of new proximal targets can be added, resulting in a proximal function (PF) measure for assessing a subjects ability to touch specific body landmarks. The accuracy, and repeatability of these measures is assessed on ten asymptomatic subjects, with and without rigid body constraints. This analysis is performed both on a low-cost depth camera system and a gold-standard active motion capture system. The addition of rigid body constraints was found to improve accuracy and concordance of the depth camera system, particularly in lateral reaching movements. Both RW and PF measures were found to be feasible candidates for clinical assessment, with future analysis needed to determine their ability to detect changes within specific patient populations.