Gait symmetry and regularity in transfemoral amputees assessed by trunk accelerations.
Gait symmetry and regularity in transfemoral amputees assessed by trunk accelerations.
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DOI：
10.1186/1743-0003-7-4
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发表时间：
2010-01-19
影响因子：
5.1
通讯作者：
Chiari L
中科院分区：
文献类型：
--
作者：
Tura A;Raggi M;Rocchi L;Cutti AG;Chiari L
本研究的目的是评估一种基于单个加速度计的方法，用于评估下肢假肢受试者的步态对称性和规律性。研究了10名经股截肢者和10名健康对照者。为了这项研究的目的，受试者在胸部和鞋垫上佩戴三轴加速度计。受试者被要求以自然速度向前走70米，并以更低和更快的速度向前走。步和步幅的规律性（Ad1和Ad2，分别）的指数获得的自相关系数计算从三个加速度分量。步和步幅持续时间计算足底压力数据，并用于计算两个参考指数（SI 1和SI 2）的步骤和步幅规律。回归分析表明，Ad1与SI1具有良好的相关性（R2达0.74），Ad2与SI2具有良好的相关性（R2达0.52）。ROC分析表明，Ad1和Ad2在将截肢者的步行试验分类为具有正常或病理性步数或步幅规律性（如通过参考指数SI1和SI2所定义的）方面通常具有良好的敏感性和特异性。其中Ad1前后向分量和Ad2垂直向分量的敏感性分别为90.6%和87.2%，特异性分别为92.3%和81.8%。使用一个简单的加速度计，其组件可以分析的自相关函数方法，是足够的评估步态的对称性和规律性，在经股截肢。
The aim of this study was to evaluate a method based on a single accelerometer for the assessment of gait symmetry and regularity in subjects wearing lower limb prostheses. Ten transfemoral amputees and ten healthy control subjects were studied. For the purpose of this study, subjects wore a triaxial accelerometer on their thorax, and foot insoles. Subjects were asked to walk straight ahead for 70 m at their natural speed, and at a lower and faster speed. Indices of step and stride regularity (Ad1 and Ad2, respectively) were obtained by the autocorrelation coefficients computed from the three acceleration components. Step and stride durations were calculated from the plantar pressure data and were used to compute two reference indices (SI1 and SI2) for step and stride regularity. Regression analysis showed that both Ad1 well correlates with SI1 (R2 up to 0.74), and Ad2 well correlates with SI2 (R2 up to 0.52). A ROC analysis showed that Ad1 and Ad2 has generally a good sensitivity and specificity in classifying amputee's walking trial, as having a normal or a pathologic step or stride regularity as defined by means of the reference indices SI1 and SI2. In particular, the antero-posterior component of Ad1 and the vertical component of Ad2 had a sensitivity of 90.6% and 87.2%, and a specificity of 92.3% and 81.8%, respectively. The use of a simple accelerometer, whose components can be analyzed by the autocorrelation function method, is adequate for the assessment of gait symmetry and regularity in transfemoral amputees.