What kind of approach would you like to perform?

The experimental setup would not be the same if you can have access to EMG, force dynamometers,... or if you have to estimate it through a musculo-skeletal model for instance.

Thanks Tom Weihmann ,

From the literature I found the proximal and distal points of the muscles on the hip bone. But during gait cycle these points are going to vary with respect to reference frame. I want to know these points during the gait cycle. So that I can apply the muscle forces in the direction which is obtained by the subtraction of the points.

Thanks Maxime Bourgain ,

I'm not performing any experimental studies.

I want to do FE analysis of hip bone by applying the muscle forces during the gait cycle. I got the magnitude of the forces for 8 phases of gait cycle from the literature but I couldn't able to get the directions.

Kandula Eswara Sai Kumar , to estimate it precisely is really complicated and a subject specific approach would be better.

But, common asumptions are made in musculoskeletal models (such as OpenSim or AnyBody) that force orientation could be deduced to muscles insertions. But this will relatively change with movement. And some muscles have geometrical constrains (names "via points" in OpenSim).

Maybe you could estimate those from an OpenSim simulation, the gait movement is in the example package. This would be a first asumption.

Thanks Maxime Bourgain ,

I'll check with OpenSim.

I think you can use this plugin.

https://simtk.org/projects/force_direction

Best regards,

Pierre

Thanks Pierre Puchaud

I installed it and it says "Error trying to load library MuscleForceDirection. Library not loaded."

I guess the pulg-in won't work for OpenSim 4.0.