Messages like to one here below are common on BIOMCH-L. As responsible for
the Standardised Femur Program I also frequently receive requests for
computer models of joint prostheses for research purposes.

Unfortunately, the prosthetic CAD models we use are commonly obtained
directly from the manufacturers with a non-disclosure clause. Thus we are
not allowed to re-distribute them. While this situation is understandable
for the prosthetic designs currently on the market, but I believe we could
do much better for those designs that are not used anymore, but for which a
large clinical history is available.

It would be great if the CAD 3D model of components such as the Howmedica
PCA or the original Charnley low-friction hip prostheses were made
available to the research community. The same applies to designs
considered unsuccessful such as the 3M Capital hip prosthesis.

The problem is that I have no idea of how to get them. Why should the
companies expose their historical designs? Which advantage would they
obtain? I know there are some colleagues working in orthopaedic companies
on the BIOMCH-L list. Could they please express their point of view on the
matter?

In theory we could also consider to recover a sample and then try some
reverse engineering. However, we would be never sure it the right design
and it is a lot of work anyway. Last, I am not sure you can put on the
public domain such reversed model without infringing any law.

I would really appreciate any feedback on this matter, which in my opinion
could boost the effectiveness of biomechanical studies on the clinical
practice.

Thanks

Marco




>From: "Andrew W. (Drew) Smith, PhD"
>Subject: A 3-D model of the femoral component
>To: BIOMCH-L@NIC.SURFNET.NL
>
>Dear friends!
>
>Does anyone arrange me to get where I can find a 3-D model of the femoral
>component of TKR (total knee replacement) prosthesis in .DXF, .OBJ, 3DS,
>.T3D, .3MF, or .B3D format?
>
>I need these files for FE analysis of stress shielding and remodelling of
>trabecular bone around the femoral component. We are trying to approach
>differently for this phenomena using "Voxel meshing program".
>
>Any help would be greatly appreciated.
>
>Thanks,
>
>Ye-Yeon, Won., M.D., Ph.D.

--------------------------------------------------
MARCO VICECONTI, PhD (viceconti@tecno.ior.it)
Laboratorio di Tecnologia Medica tel. 39-051-6366865
Istituti Ortopedici Rizzoli fax. 39-051-6366863
via di barbiano 1/10, 40136 - Bologna, Italy

Tiger! Tiger! Burning bright in the forest of the night,
what immortal hand or eye could frame thy fearful symmetry?
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Opinions expressed here do not necessarly reflect those of my employer

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