Failed to resolve kinematic constraints

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1

Hello,
I’m adding an atlanto-axial joint implant to the cervical spine in AnyBody. But it fails at the kinematic step, and the window shows the following information:

Failed to resolve kinematic constraints. Too many iterations used (final kin. error = 2.822234E+000).
Constraint no. #0 in ‘Main.HumanModel.BodyModel.Trunk.JointsCervicalSpine.C1C0Jnt.Constraints’ above error tolerance 0.000001, error = 0.001000.
Constraint no. #1 in ‘Main.HumanModel.BodyModel.Trunk.JointsCervicalSpine.C1C0Jnt.Constraints’ above error tolerance 0.000001, error = 0.004000.
Constraint no. #0 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Mus.ArtificialRake.LinCombDrv’ above error tolerance 0.000001, error = 0.049550.
Constraint no. #1 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Mus.ArtificialRake.LinCombDrv’ above error tolerance 0.000001, error = 0.295634.
Constraint no. #2 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Mus.ArtificialRake.LinCombDrv’ above error tolerance 0.000001, error = 0.128179.
Constraint no. #0 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Mus.ArtificialRake.LinCom2Drv’ above error tolerance 0.000001, error = 0.100000.
Constraint no. #1 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Jnt.SCLinCon’ above error tolerance 0.000001, error = 0.003427.
Constraint no. #2 in ‘Main.HumanModel.BodyModel.Right.ShoulderArm.Jnt.SCLinCon’ above error tolerance 0.000001, error = 0.016070.
……
ERROR(OBJ.MCH.KIN3) : D:/P…s/A…y/A…2/AMMR/A…n/E…s/M…l/MaxForceNeckModel.main.any : Study.InitialConditions : Kinematic analysis failed in time step 0

How can I solve this problem?

Thank you in advance for your help!

2

First, the implants seem to be not at the proper position when you load the initial condition, that means there is no contact between the implants.

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