Multiple Joints between two bodies

[David John Saxby]

Hi All,

I want to sum the moments about the medial and lateral condyles of the tibia during various gait tasks. Is there an established OpenSim way to do this? (in fact I also need to output the muscle moment arms with respect to these points as well).

Our current OpenSim model has a 3 dof knee with 3D translation on spline surface. Is it possible to either create 1) a body i.e. "right_tibia", which has > 1 joint between the similar segments. For example "right_knee" linking the tibia and femur, but also "right_varus" and "right_valgus" that also link the tibia and femur?

or 2) 'dummy' bodies instead of additional joints with inertial values offset from the body location?

Any ideas or suggestions would be greatly appreciated!

G'day

David Saxby

[David John Saxby]

Hi All,

I believe the Analyze --> Joint Reaction tool will permit this analysis? Can we also output moment arms relative to these points?

David