Spinal Vertebral Segment Displacement

[pgalibarov]

Hi Faizal,

Yes to FDK, but you could also check how the lumbar spine disc stiffnesses and ligaments are defined.

Regarding where to make changes - ideally you would not want to change the repository as it would not be correct to refer to a particular version of AMMR anymore.

Most of the changes can be done without modifying the AMMR code. You can change the joint type using code, for example:

Main.HumanModel.BodyModel.Trunk.JointsCervicalSpine.C1C0Jnt.Constraints.CType = {Soft, Soft, Soft, Soft, Soft};

You may want to remove the cervical spine rhythm (#define BM_TRUNK_CERVICAL_RHYTHM OFF) and add a new using the code similar to this:

Sensitifity of Force Dependent Kinematics (FDK) to inital driver definition

Hi Tobias, We have identified the reason behind the difference in results. This is happening due to the nature of FDK, which tries to minimize reaction forces/moments in the FDK degrees of freedom in the given time point. By choosing different level to be excluded we solve a slightly different problem and leave the remaining DoF in a suboptimal condition if we think of it in terms of a reaction force/moment, the muscle recruitment ensures that the system is in equilibrium by finding needed forc…

Kind regards,
Pavel