Hi Snehal, Thanks for your kind reply! Now, I built four imaginary rigid bodies at the joint center and rigid lock each of them to the tibia (in my simulation, the tibia is moving, while the femur is fixed). Then I tied the tibial nodes of each ligament to each rigid body separately, instead of usin...

Hi Snehal, Thanks for your kind reply! I tried to plot the nodal reaction forces at the tied faces of the ligament. However, the force is the total reaction force of the femur/tibia. I hope I could examine each ligament force during simulation. I also posted a question on the FEBio forum and I hope ...

Hi, I was using the FE model of Generation one to simulate a squatting motion and I do care about the ligament forces with relationship to time. However, I have no idea how we can output the ligament forces of 3D-modelling ligaments. Does anyone know how to do that in FEBio? Any helps, I will apprec...

Hi Dr. Schwartz, Thank you so much for your kind reply! It helps me a lot! To clarify my previous post, I used one FEBio step from time 0 to 2 to apply prestrain(time 0 to 1) and loading (time 1 to 2). And I used the load curve to control the loading. I attached the Feb file as this link: https://dr...

Hi Dr.Schwartz, Thank you so much for your quick and patient reply! That's super helpful! When I'm working with the simulations with augmentation turned off in the update, the simulation's results look well. However, I still have a few questions about prestrain constraints confusing me: 1.when I tur...

Hi Dr. Schwartz, Thank you so much for your kind reply! I appreciate it a lot! According to your suggestions, I used the initial value of prestrain and applied 10Nm valgus loading. Then I found it actually couldn't work. After I changed the material definition to the same as your example, it's worki...

Hi Dr. Schwartz, Thank you so much for your quick reply! Based on your suggestions, I fixed all the rotation freedom in the prestrain application step and applied valgus/varus torque. In results, the prestrain step converges, and the prestrain stretch in the Postview looks good (Fig 1). However, the...

Hi Dr.Schwartz, Thanks for your patience and help! According to your suggestions, I turned off the augmentations in my simulation and the prestrain application step successfully terminated. However, when I added the valgus step after the prestrain, the simulation got terminated immediately. But when...

Hi Dr.Schwartz, Thank you so much for your kind reply! During these days, I am working on this simulation which is refined based on your suggestions. However, I still have convergence problem and the simulation terminated at time 0.5/0.6. This is how I defined the prestrain constraint: <Constraints>...

Hi Dr.Schwartz, Thank you so much for your kind reply! That is super helpful. I have already revised my file based on your suggestion. But I still have one more question about update rule which is confusing: Should the update rule only work in the prestrain application step? Should I turn off the up...