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All example files are included in the Model folder "ToyDropLanding" included with the OpenSim installation. |
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- Verify that the model is in its Default pose, with platform_rx set to 20 degrees, platform_ry to 0 degrees, platform_rz to 0 degrees, and platform_ty to -0.5 meters. All four platform coordinates should be locked. This will prevent the platform from falling or rotating on impact.
- Find the Simulate button (Green Runner) in the OpenSim Toolbar. This button is used to perform a forward simulation.
- Click the arrow next to the Simulate button, and select the End Time... drop down item.
- In the popup dialogue, set the simulation time to 0.4 seconds.
- Click the Simulate button to simulate for 0.4 seconds. OpenSim will use the current pose of the model in the GUI as the starting state for the simulation. The model will animate during the forward simulation.
- Once the simulation has completed, you can use the animation controls above the view window to play, pause, and scroll through the resulting motion and muscle activity. Zoom in on the ankle joint and replay the motion.
- Click on the Navigator panel and find the Motions list. The motion Results in bold corresponds to the simulation you just generated.
- Right click the bold "Results" motion and Rename... it to "Unassisted".
- To save the results, right click the "Unassisted" motion and select Save As... (e.g., Results_Unassisted.sto).
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- What is the maximum subtalar angle during the drop landing?
- Would an ankle inversion injury have occurred during this landing? According to previous research (Siegler et al., 1990; Lapointe et al., 1997), angles larger than 25 degrees may cause injury.
III. Analyze the effects of an ankle–foot orthosis (AFO) on ankle inversion
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