2018 Volume Annual56 Issue Abstract Pages S188
At the beginning of the pendulum-test, some fluctuation is induced in the femur by its upward shifting with releasing of lower-leg. This study analyzes its influence upon lower-leg motion by simulations. The fluctuation is controlled by a viscoelastic element of the iliopsoas muscle including the sitting seat. Behavior of all over the leg is modeled as a double pendulum constructed based on the viscoelastic elements and an existing lower-leg sub-model. We analyzed the femoral motion and the lower-leg motion under the double pendulum model. It was seen from the results that a tiny and nonlinear fluctuation like that appeared in measured angular acceleration waveforms exists also in the simulated lower-leg ones, and that its amplitude increased with increases of the upward shifting or advance of spasticity. One of the urgent works is to investigate some way to remove the fluctuation from measured waveform.
