Hi, Meanwhile, we have solved part of our problem. We now managed to implement the DO output into the JRA. For this, we basically, like James, paste the muscle forces into the SO force file. However, we did some comparisons and found that it makes no difference at all which data is in the columns fo...

Hi James, First of all, thank you for your quick response. We have looked at both scripts, however, unfortunately we have not yet been able to fully use them to solve our problem. We had previously managed to create the xml file of the External Loads, however, we would like to get the raw data outpu...

Hi OpenSim experts, We aim to compare several biomechanical parameters (muscle forces, joint contact forces, etc.) between different running speeds. To this purpose we are using dynamic optimization (DO) in Matlab (CasADi optimization; De Groote 2016) to determine muscle forces over a period of stea...

Hi Nicos Haralabidis, First of all, thank you very much for your quick response. We are using the Catelli model (https://pubmed.ncbi.nlm.nih.gov/30398067/). This model has optimized the MTU paths and moment arms of the knee and hip extensors for movements like deep squating and cycling so it should ...

Hi OpenSim-experts, We aim to compare several biomechanical parameters (muscle force, joint reaction force, etc.) between running speeds. To this purpose we are using dynamic optimization (DO) in Matlab to solve the joint moments (CasADi optimization) over a 15-sec period of steady-state running. Ho...

Hi,

Thanks for you reply Mohammadreza Rezaie. Now it's clear how to use the Joint Reaction in the AnalyzeTool in Matlab. In this way it's also possible to change the joints, bodies en frames of the joint reaction forces.

Lars

Hi Aaron Fox, First of all, thank you very much for your quick response. We did some changes in de xml-file and now it is working pretty fine. We have one last question about the AnalyzeTool. To perform a Joint Reaction Analysis we have to select a force_file in the AnalysisSet (in the attached xml-...

Hi OpenSim-users, For our study we have to perform the joint reaction analysis and muscle analysis for a lot of trials. Because performing all trials manually in the Analyze-tool in OpenSim is very time demanding, we want to use Matlab to perform these analysis all in ones. However, when using de op...

Dear Prof. van den Bogert, First of all, thank you very much for your quick response. We also want to thank you for your time and input. We have already contacted Motek about a week ago with our question about the high ankle moment and the difference between before and after GOAT analysis. When we h...

Dear Prof. van den Bogert, Thank you very much for your response. We visualized the GRF vector in OpenSim and this looked accurate. In the attached figure we have determined the distance between the ankle joint center (AJC) and the center of pressure (COP) for the X, Y and Z directions. The dashed l...