Lumbar ligaments

[john1 (qin)]

When I set BM_TRUNK_LIGAMENTS to ON in BodyModel.defaults.any, the axial and shear forces experienced by all lumbar joints increased dramatically, from 20 to 100N.Why did this ligament switch make such a big difference ? Thank You!

[Bjorn (Bjørn Keller Engelund)]

Hi @john1

The ligaments in the trunk are somewhat experimental - you will probably need to verify the parameters and most certain you will need to calibrate them using a calibration study.

We have a tutorial on how to work with ligaments here

Best regards,
Bjørn

[john1 (qin)]

Thank you for your help. Good luck！