I aimed to enhance the degree of freedom in the knee joint of Rajagopal Model, which currently has only one degree of freedom.
If I were to modify your model to increase the degree of freedom, would that be acceptable, or would it be considered inappropriate without ligaments?
degree of freedom at knee joint
- Rohan Kothurkar
- Posts: 30
- Joined: Sat Sep 14, 2019 7:37 am
- Mohammadreza Rezaie
- Posts: 390
- Joined: Fri Nov 24, 2017 12:48 am
Re: degree of freedom at knee joint
Hi, it depends on your research question. You can find a model with knee ligaments and more knee DoF here: https://simtk.org/projects/opensim-jam
But generally, it might not be a good idea. Because the other knee DoFs cannot be measured accurately using skin mounted markers [1] and it leads to inaccurate and unreliable muscles kinematics, abnormal muscles activity/force, and hence, knee joint contact force. Please see this:
viewtopicPhpbb.php?f=91&t=12587&p=0&sta ... 139d1e8621
viewtopicPhpbb.php?f=91&t=12919&p=0&sta ... eec78cd468
[1] Benoit et al. (2006). Effect of skin movement artifact on knee kinematics during gait and cutting motions measured in vivo. https://doi.org/10.1016/j.gaitpost.2005.04.012
But generally, it might not be a good idea. Because the other knee DoFs cannot be measured accurately using skin mounted markers [1] and it leads to inaccurate and unreliable muscles kinematics, abnormal muscles activity/force, and hence, knee joint contact force. Please see this:
viewtopicPhpbb.php?f=91&t=12587&p=0&sta ... 139d1e8621
viewtopicPhpbb.php?f=91&t=12919&p=0&sta ... eec78cd468
[1] Benoit et al. (2006). Effect of skin movement artifact on knee kinematics during gait and cutting motions measured in vivo. https://doi.org/10.1016/j.gaitpost.2005.04.012
- Rohan Kothurkar
- Posts: 30
- Joined: Sat Sep 14, 2019 7:37 am
Re: degree of freedom at knee joint
Dear Mohammadreza Rezaie,
Thanks
Prof. Bogert's response was convincing. What if I include knee ligaments in the Rajagopal model?
Example : https://simtk.org/projects/kneemodel/
Kind Regards,
Rohan
Thanks
Prof. Bogert's response was convincing. What if I include knee ligaments in the Rajagopal model?
Example : https://simtk.org/projects/kneemodel/
Kind Regards,
Rohan