Marker Layout for Inverse Kinematics
Posted: Mon Nov 25, 2024 6:44 pm
Hello OpenSim Community,
I am currently designing a study to assess kinematics, kinetics, and muscle-tendon dynamics around the ankle joint similar to what Yong et al., 2020 https://www.nature.com/articles/s4 ... 464-3#Sec3 did using the updated rajogopal/ulrich model (2023)https://ieeexplore.ieee.org/document/7505900. There was only one degree of freedom (plantar/dorsiflexion) used here, and the subtalar joint was locked/welded;
My question is that if I wanted to take a deeper look at the kinematics and kinetics about the mtp joint - simply through tracking its unlocked kinematics with the IK tool - I'm interested in knowing what markers would be vital for this research question relative to what was used with the template marker layout provided with the full-body model used by Yong and colleagues in the aforementioned nature publication.
Based on the seminar that was also held by jennifer yong https://www.youtube.com/watch?v=ZG7wzv ... nSimVideos, I was still unclear as to how important redundant tracking and anatomical markers were to the performance of the IK tool /dynamic trials (i.e. in theory, if you had full confidence in your segmental cluster markers if you had such on ALL segments you were trying to track in dynamic trials following scaling and they were registered correctly, would it be problematic to place full weighting on them and remove anatomical markers from being collected altogether?).
For further context, one may assume that;
i) 'windows' are being cut into footwear in order to attach additional markers onto first and second phalangeal digits,
ii) these added markers to the toes (and possibly to the foot too?) are sufficient for creating the necessary reference frame that can be used to scale the toes too
iii) that I am able to sufficiently calculate inverse dynamics based on variably applying the external GRFs to differing spots on the foot based on CoP coordinates in order to calculate moments about the MTP joint
Hope this post wasn't too lengthy, but please advise if any further details would help.
Any thoughts would be appreciated here,
Adam
I am currently designing a study to assess kinematics, kinetics, and muscle-tendon dynamics around the ankle joint similar to what Yong et al., 2020 https://www.nature.com/articles/s4 ... 464-3#Sec3 did using the updated rajogopal/ulrich model (2023)https://ieeexplore.ieee.org/document/7505900. There was only one degree of freedom (plantar/dorsiflexion) used here, and the subtalar joint was locked/welded;
My question is that if I wanted to take a deeper look at the kinematics and kinetics about the mtp joint - simply through tracking its unlocked kinematics with the IK tool - I'm interested in knowing what markers would be vital for this research question relative to what was used with the template marker layout provided with the full-body model used by Yong and colleagues in the aforementioned nature publication.
Based on the seminar that was also held by jennifer yong https://www.youtube.com/watch?v=ZG7wzv ... nSimVideos, I was still unclear as to how important redundant tracking and anatomical markers were to the performance of the IK tool /dynamic trials (i.e. in theory, if you had full confidence in your segmental cluster markers if you had such on ALL segments you were trying to track in dynamic trials following scaling and they were registered correctly, would it be problematic to place full weighting on them and remove anatomical markers from being collected altogether?).
For further context, one may assume that;
i) 'windows' are being cut into footwear in order to attach additional markers onto first and second phalangeal digits,
ii) these added markers to the toes (and possibly to the foot too?) are sufficient for creating the necessary reference frame that can be used to scale the toes too
iii) that I am able to sufficiently calculate inverse dynamics based on variably applying the external GRFs to differing spots on the foot based on CoP coordinates in order to calculate moments about the MTP joint
Hope this post wasn't too lengthy, but please advise if any further details would help.
Any thoughts would be appreciated here,
Adam