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hi,
I want to extracte the moment arms for each muscle, How should I operate and whether there are related examples?

Hey Cui Weilling,

Open the model in opensim -> Tools -> Plot -> Y-Quantity -> Moment arm -> muscles (Choose the ones you want) -> X-Quantity(Joint angle against which you want the moment arm to be computed with. Typically the joints over which the muscle acts.) -> Add.

Good Luck,
Shravan