Include/exclude subtalar joint in custom static optimization practice
Posted: Mon Mar 06, 2023 8:04 am
Hello,
I have a question about whether on not to include subtalar joint moment in equality constraint in custom static optimization [moment-matching approach].
I see a huge variability in the subtalar kinetics in some of the subjects in my data. These are multiple trials of one subject during walking (same leg): If I lock the subtalar joint in the model, I will see unusual movements in the proximal segments, particularly in transverse plane. So, I unlock it in order to improve inverse kinematics.
If I include subtalar moment in the static optimization, I see significant difference in ankle joint contact force. This is ankle contact force in one trial (both legs): I have no idea about what the source of such variability in subtalar moment would be, e.g., measurement or modelling errors. But the subtalar kinematics is much less variable. In this case, I think it's better to unlock subtalar joint but exclude it in static optimization. So, the results would be more reliable. Please let me know your thoughts.
Any help is greatly appreciated.
Regards,
Mohammadreza
I have a question about whether on not to include subtalar joint moment in equality constraint in custom static optimization [moment-matching approach].
I see a huge variability in the subtalar kinetics in some of the subjects in my data. These are multiple trials of one subject during walking (same leg): If I lock the subtalar joint in the model, I will see unusual movements in the proximal segments, particularly in transverse plane. So, I unlock it in order to improve inverse kinematics.
If I include subtalar moment in the static optimization, I see significant difference in ankle joint contact force. This is ankle contact force in one trial (both legs): I have no idea about what the source of such variability in subtalar moment would be, e.g., measurement or modelling errors. But the subtalar kinematics is much less variable. In this case, I think it's better to unlock subtalar joint but exclude it in static optimization. So, the results would be more reliable. Please let me know your thoughts.
Any help is greatly appreciated.
Regards,
Mohammadreza