A Three-Dimensional Biomechanical Evaluation of Quadriceps and Hamstrings Function Using Electrical Stimulation
A Three-Dimensional Biomechanical Evaluation of Quadriceps and Hamstrings Function Using Electrical Stimulation
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DOI：
10.1109/tnsre.2009.2014235
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发表时间：
2009-04-01
影响因子：
4.9
通讯作者：
Dhaher, Yasin Y.
中科院分区：
文献类型：
--
作者：
Hunter, Betsy V.;Thelen, Darryl G.;Dhaher, Yasin Y.
神经系统疾病，如中风损害运动控制，并导致异常的三维步态运动学。建立有效的康复策略，需要了解如何个别肌肉有助于病理运动。正向动力学模拟考虑了关节间耦合的复杂性，并可用于预测动态肌肉功能。然而，到目前为止，有限的实验验证的动态模型已经完成。我们的目标是测量三维运动引起的股二头肌（BF），股直肌（RF），股外侧肌（VL）在肢体配置对应的摆动阶段的步态，并评估生物力学因素，影响动态功能。受试者被放置在机器人步态矫形器，包括一个兼容的接口。将电刺激引入个体肌肉，同时记录诱导的髋关节和膝关节运动。测量髋膝关节矢状面加速度比与动态肌肉骨骼模型模拟一致。然而，RF和VL诱导的额状面髋关节运动比基于模型的预测大得多。对肌肉骨骼模型参数的敏感性分析表明，肌肉功能主要取决于力臂假设。虽然一般的肌肉骨骼模型是适合于预测矢状面肌肉功能，改善力臂精度是必不可少的3-D病理步态调查。
Neurological disorders such as stroke impair locomotor control and result in abnormal 3-D gait kinematics. Establishment of effective rehabilitation strategies requires an understanding of how individual muscles contribute to pathological movement. Forward dynamic simulations account for complexities of interjoint coupling and can be used to predict dynamic muscle function. However to date, limited experimental validations of dynamic models have been performed. Our objective was to measure 3-D movement induced by the biceps femoris (BF), rectus femoris (RF), and vastus lateralis (VL) in limb configurations corresponding to the swing phase of gait, and to assess the biomechanical factors that affect dynamic function. Subjects were positioned in a robotic gait orthosis that included a compliant interface. Electrical stimulation was introduced into individual muscles while induced hip and knee joint movements were recorded. Measured hip to knee sagittal plane acceleration ratios were consistent with dynamic musculoskeletal model simulations. However RF and VL induced substantially larger frontal plane hip movements than model-based predictions. Sensitivity analyses on musculoskeletal model parameters revealed that muscle function depends primarily on moment arm assumptions. Though generic musculoskeletal models are suitable for predicting sagittal plane muscle function, improvements in moment arm accuracy are essential for investigation of 3-D pathological gait.