Abstract Spinal cord injured subjects with hip flexion ability may often walk with the help of orthosis and crutches. Typically, the orthotic devices are attached to the legs by means of several braces. Excessive pressure in such contacts may lead to skin wounds and to subsequent loss of adherence to the use of the orthoses. Since contact pressures are related to contact forces, estimation of the leg-orthosis contact forces is relevant to assess the suitability of an orthotic device for a specific subject, or to redesign the braces for pressure reduction. In this paper, a procedure to estimate such contact forces from simple gait analyses is proposed. It consists of building computational multibody models of subject and devices, and running a forward-dynamics analysis of the orthoses in which the captured motion of the subject is prescribed. At least one force/torque sensor per orthosis is required to calibrate the model. In this case, an extensometry-based load cell was used for such purpose. Results showed that, once calibrated, the model was able to reproduce torque sensor measurements for different motions.

中文翻译：

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从步态分析估计腿部矫形器的接触力

摘要 具有髋屈曲能力的脊髓损伤受试者可能经常在矫形器和拐杖的帮助下行走。通常，矫形装置通过几个支架连接到腿上。这种接触中的过大压力可能导致皮肤伤口和随后失去对使用矫形器的依从性。由于接触压力与接触力有关，腿部矫形器接触力的估计与评估矫形装置对特定对象的适用性或重新设计支架以降低压力有关。在本文中，提出了一种通过简单步态分析来估计这种接触力的程序。它包括构建对象和设备的计算多体模型，并对其中规定了对象的捕获运动的矫形器进行前向动力学分析。每个矫形器至少需要一个力/扭矩传感器来校准模型。在这种情况下，基于引伸计的称重传感器用于此目的。结果表明，一旦校准，该模型就能够再现不同运动的扭矩传感器测量值。