Knee extension of the model including patella

Overall purposes of the project are:

1) To provide free access to a three-dimensional finite element representation of the knee joint

2) Open development of a knee model for collaborative testing and use
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Lefteris Benos
Posts: 2
Joined: Thu Jul 12, 2018 10:41 pm

Knee extension of the model including patella

Post by Lefteris Benos » Mon Oct 22, 2018 12:07 am

Hi everyone,

I am attempting to get a knee extension of the model including patella, its cartilage as well as the tendon.
The only available geometry that I have found is in the openknee site pertaining to oks001 specimen.

Thus, I used the reference patella geometries in conjunction with the tibiofemoral joint geometry that is included in the "tf_joint_FEBio_v2.feb".

As you can see in the image that I have attached, patella is not in contact with the femoral cartilage.
Is there any geometry including patella in the model.
If yes, where can I found the .feb or the stl. file?

Thank you in advance for your help.

Best,
Dr. Lefteris Benos
Centre for Research & Technology Hellas (CERTH)
knee joint plus patella.JPG
knee joint plus patella.JPG (38.24 KiB) Viewed 1532 times

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Ahmet Erdemir
Posts: 77
Joined: Sun Sep 10, 2006 1:35 pm

Re: Knee extension of the model including patella

Post by Ahmet Erdemir » Mon Oct 22, 2018 5:24 am

Dear Lefteris,

oks001 is NOT the specimen modeled in Open Knee(s) - Generation 1, which is in tf_joint_FEBio_v2.feb. You can get the geometries for Open Knee(s) - Generation 1 in the source code repository, specifically at

https://simtk.org/svn/openknee/_gen1/da ... rsion2geo/

Please note that when generating the model (tf_joint_FEBio_v2.feb) a coordinate system transformation was applied to the raw mesh file, which is described in the User's Guide. You need to apply the same coordinate transformation to geometries of extensor mechanism so that they align with the rest of the model.

You may also want to check

https://simtk.org/projects/cphmbkneefem

This is a model from folks at Cal Poly, who extended the Open Knee(s) - Generation 1 by adding the patella.

Best,

Ahmet

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Lefteris Benos
Posts: 2
Joined: Thu Jul 12, 2018 10:41 pm

Re: Knee extension of the model including patella

Post by Lefteris Benos » Tue Oct 23, 2018 1:02 am

Thank you for your prompt reply.

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