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Hey guys

I would like to obtain the muscle forces of scone results of deficits weakness (gs-pf-so) from the following paper
"Predicting gait adaptations due to ankle plantarflexor muscle weakness and contracture using physics-based musculoskeletal simulations"
https://simtk.org/frs/?group_id=1631

to do this, I have opened the osim model and run inverse dynamic tools by entering the motion.sto from the results folder. then plot the total muscle fiberforce through Tools>Plot.

the issue is that muscle force for gastroc muscle is not displayed:
Do you know how to get the muscle forces of optimization scone result?

Hi Samane, this seems like a question for the OpenSim team. Please have a look at the OpenSim forum

Hey Thomas

Ok sure. So do you think to have muscle force of scone result, I have to use only ID opensim? is there any way at scone?

If you run a SCONE simulation, the muscle force (along with many other parameters) will be available -- both in the 'Analysis Window' in SCONE as well as in the .sto file that is generated automatically. Check Tools -> Preferences -> Data to select the data that is exported.

To see it in action, simply evaluate one of the .scone scenarios from the Tutorials or Examples folder.

thank you for fast replying.

I have done it. but a strange thing is the muscle forces range is less than 1. Are the forces scaled?

Yes, these are normalized by max_isometric_force. If you want the total force (and other properties), go to Tools -> Preferences -> Data and check the box next to 'Output muscle properties'.

I have a similar question
If muscle forces are normalized by Max isometric forces, are the loads also normalized? Because I'm getting a back load of around 0.5 +- 0.2 for a normal gait cycle. I'm a bit confused as to what the unit is on the y axis.

Loads are normalized by body weight (i.e. divided by mass * g).

tgeijten wrote: ↑

Fri Jun 10, 2022 3:39 am

Loads are normalized by body weight (i.e. divided by mass * g).

Thanks!