Ramakrishnan Tyagi, Lahiff Christina-Anne, Reed Kyle B
Rehabilitation Engineering and Electromechanical Design Laboratory, Department of Mechanical Engineering, University of South Florida, Tampa, FL, United States.
Front Neurorobot. 2018 Feb 13;12:2. doi: 10.3389/fnbot.2018.00002. eCollection 2018.
Physical changes such as leg length discrepancy, the addition of a mass at the distal end of the leg, the use of a prosthetic, and stroke frequently result in an asymmetric gait. This paper presents a metric that can potentially serve as a benchmark to categorize and differentiate between multiple asymmetric bipedal gaits. The combined gait asymmetry metric (CGAM) is based on modified Mahalanobis distances, and it utilizes the asymmetries of gait parameters obtained from motion capture and force data recorded during human walking. The gait parameters that were used in this analysis represent spatio-temporal, kinematic, and kinetic parameters. This form of a consolidated metric will help researchers identify overall gait asymmetry by showing them if the overall gait symmetry is improving and avoid the case where one parameter's symmetry is improving while another is getting worse. The CGAM metric successfully served as a measure for overall symmetry with eleven different gait parameters and successfully showed differences among gait with multiple physical asymmetries. The results showed that mass at the distal end had a larger magnitude on overall gait asymmetry compared to leg length discrepancy. It also showed that the combined effects are varied based on the cancelation effect between gait parameters. The metric was also successful in delineating the differences of prosthetic gait and able-bodied gait at three different walking velocities.
诸如腿长差异、在腿部远端增加重物、使用假肢以及中风等身体变化常常会导致不对称步态。本文提出了一种度量标准，它有可能作为一个基准，用于对多种不对称双足步态进行分类和区分。组合步态不对称度量（CGAM）基于修正的马氏距离，并且它利用了从人体行走过程中记录的运动捕捉和力数据中获得的步态参数的不对称性。本分析中使用的步态参数代表时空、运动学和动力学参数。这种形式的综合度量将通过向研究人员展示整体步态对称性是否正在改善，来帮助他们识别整体步态不对称性，并避免出现一个参数的对称性在改善而另一个参数的对称性却在变差的情况。CGAM度量成功地作为一种衡量整体对称性的指标，用于十一个不同的步态参数，并成功地显示了具有多种身体不对称性的步态之间的差异。结果表明，与腿长差异相比，腿部远端的重物对整体步态不对称性的影响更大。研究结果还表明，基于步态参数之间的抵消效应，综合效应各不相同。该度量标准还成功地描绘了三种不同步行速度下假肢步态和健全人步态的差异。
