Subjects with significant gait impairments may require the use of external support to safely walk during motion capture collections [1]. Development of musculoskeletal simulations in the OpenSim environment, however, is complicated by external forces beyond ground reaction forces. Measured ground reaction forces and moments may be dynamically inconsistent with model kinematics due to modeling assumptions and experimental error [2]. With the addition of external forces applied using handrails, a harness support system or other loads, prediction of muscle forces and contribution to movement may be inaccurate, especially if all external forces are not able to be measured and included in the model.

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