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  #1  
Old 02-12-2013, 12:39 PM
sip0sip sip0sip is offline
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Default Manbible model

Hi,
I am new to AnyBody. I am interested in the musculoskeletal model of the mandible (its movement, muscle forces, TMJ forces, etc.). I have the AnyBody 4.0.1.626, that means I have the Model Repository V1.0 (if I understand it right). In this repository I haven’t find the mandible model. Somewhere I have read that the mandible model is in Repository 7, that means, which version of Anybody do I need?

Thank you
Michala

[edit] I found the repository page on the Internet (http://forge.anyscript.org/gf/) and the mandible model as well. Sorry for the post, but it was not clear in the beginning that the repository is online and does not go only with the instalation.

Last edited by sip0sip; 02-12-2013 at 01:21 PM. Reason: I found what I was looking for.
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  #2  
Old 02-12-2013, 02:27 PM
sip0sip sip0sip is offline
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Hi,
This is more a reaction on one old post
http://forum.anyscript.org/showthread.php?t=2147&highlight=mandible

I am aware of the fact that these posts are quite old. But anyway, I have a question – the model there was driven just by one point (movement of the mandible governed by the movement of the incisor point) – isn’t that to little? What about the rotations? Also the medio-lateral movement was set to zero. So in the end is the mandible rotating or not? Is the mandible model in the Repository 1.5 better (I don’t have yet the skills to explore the files)?

Michala
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  #3  
Old 02-13-2013, 09:35 AM
markdezee markdezee is offline
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Hi Michala,

This is what I did. In my model of the human jaw I force the condyles of the TMJ to be in contact with the fossa. In this way I end up with a mandible with 4 DoF.

For driving the model I used one marker at the frontal incisors.
Moreover I drive the sideways movement of the condyle to be zero. In
this way I end up with kinematic determinant system.

It is best to use the newest repository. However, I do not think that in the mandible case, there is a big difference.

Greetings, Mark
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  #4  
Old 02-23-2013, 05:24 PM
sip0sip sip0sip is offline
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Hi,
I was going through the model repository that goes with the AnyBody version 5.3.1, especially the mandible model under the folder AUHuman. But since I am quite new to AnyBody, I was not able to run this example. I was looking for a “Main” file, but there are just:
SymetricMandible.root.any
SymetricMandibleHill.root.any
VirtualDistractionMandible.root.any

and when I tried to run one of them, I got the following error:
C:/../SymmetricMandible.root.any : 'AnyFolder' when 'Main' was expected

How can I run these models?

Thanks
Michala
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  #5  
Old 02-26-2013, 03:50 PM
aalmunajjed aalmunajjed is offline
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HI Michala,

the files that you found are not full models, they are just what we call "body parts".

The repository is divided into applications, with all the models and the body folder with all the parts to make a body for a model. If you look at the mandible model in Application/Validation/Mandible...
you'll see in the Main file that these xxx.root.any files are included there to build the model.
******************
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Please provide AMMR and AMS version numbers in case you send a debug model. The folder structure should follow the standard in the AMMR. This makes it a lot easier for us to answer your questions faster.

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  #6  
Old 02-26-2013, 05:33 PM
sip0sip sip0sip is offline
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Hi,
Thanks, this is what I was looking for.

Michala
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  #7  
Old 03-13-2013, 09:50 AM
sip0sip sip0sip is offline
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Default Scaling trajectories

Hi,
I now more or less understand the scaling technique in AnyBody, but what I am not getting yet is the scaling of the input trajectories of the markers. In the mandible example, the marker´s trajectory (lower incisor point) is loaded as:

AnyKinEqInterPolDriver ChewingMovement = {
AnyKinMeasure &ref = .LowerIncisorDistance;
Type = Bspline;
BsplineOrder = 4;
FileName = "ChewingRight.txt";
Reaction.Type = {Off,Off,Off};
};

What happens when I scale the model? Let´s say, if I exaggerate it, the model is now twice as big, so the ratio between the model and the trajectory will be different. How should I use the scaling in this example?

Thanks
Michala
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  #8  
Old 03-13-2013, 05:58 PM
sip0sip sip0sip is offline
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Default joint reaction force

Hi,
what exactly is the „reaction force“: Main.Model.HumanModel.Jnt.ReactionForceTMJ_R.Ft in the mandible model? What is its direction? And why, for the same movement, this result is different when I change the muscle physiological properties?
Thanks for any comments
Michala
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  #9  
Old 03-15-2013, 11:49 AM
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toerholm toerholm is offline
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Hi Michala,

If you open the file

Jnt.any file in the mandible model you will see a linear measure named
"TMJ_JntR"

Try to add the line inside the measure and you will see a cooridnate system
"
SkullRef ={
AnyDrawRefFrame drw={};};
"

If you look further down the jnt.ny file you will see that the reaction force you are looking for act on the z axis of the coordinate system visualized above.

The reason why you will see diff results on the reaction is that if you change the model paramters such as muscle attachment point muscle strength etc. is that the new confiration will choose to use the reaction force differently. The muscle recruitment algorithm will have get diff input paramters in terms of muscle moment arm, strength etc and this may all change the way it will use the reaction force. If all moment arms are much bigger the reaction force would drop. If one muscle with a big moment arm gets weaker it would require other muscles to take over the loads and if they have a smaller moment arm the reaction force would then increase.

Best regards
Søren
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  #10  
Old 04-08-2013, 12:55 PM
sip0sip sip0sip is offline
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Default Defining the TMJ

Hi,
Does anybody have an idea how I could define the temporomandibular joint, that could fulfill the attached movement of the condyles? The joints in the mandible model in the model repository are constraint to move between two planes, therefore the trajectory of the condyles in the sagittal plane is a line. However, what we have measured looks more an ellipse. Is there a way how I can model this movement?

So far I have tried the approach without the joint - that I have the kinematics and want the muscles to fulfill the movement. But it seems that at some point it just cannot cover the movement in all the DOFs. So I have to constraint the joint somehow. But how?

The difference between the reality and my model is the missing cartilaginous disc, which loaded/unloaded cause this "strange" movement pattern.

Michala
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File Type: jpg InputKinematics.jpg (13.5 KB, 11 views)
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