Dear Karl,
Thanks for your interest in the lumbar spine model. For the other
members of this group, the paper Karl is referring to can be downloaded
from:
http://www.ime.auc.dk/~mdz/pdf/DeZee_et_al_zaragoza.pdf
In a very short time we will have a first version ready of the lumbar
spine model. This one will be available from the repository on the
AnyBody website. This model will include most muscles of the lumbar
part. You should be aware of the following facts:
- The model is not evaluated. We are planning on doing some experiments
in the beginning of next year. This of course doesn’t mean that you
couldn’t use it, but maybe a sort of validation is needed for your own
purpose.
- The muscles do not include the force-length-velocity relations (i.e.
we use the socalled simple muscle model). The only input parameter in
the muscle model is the cross-sectional area multiplied by a factor. At
the moment we use a specific muscle tension of 46 N/cm2. Daggfeldt and
Thorstensson (J.Biomech. 2003, 36: 815-825) didn’t include the
force-length-velocity relations either.
- In the paper we wrote that we include ligaments, but we have to
exclude those in the first version of the spine model, because we do not
have the necessary mechanical properties. This is however not a problem,
because it has been shown that the torque production from ligaments
might not be very important (Cholewicki and McGill, J.Biomech. 1992, 25:
17-28).
-The mechanical effect of the intra-abdominal pressure (IAP) will not be
included on short term, but we’ll work on it.
A model like our lumbar spine model has certainly room for improvement.
That is also one of the reasons, that we really would like other
research groups to use and scrutinize our model.
Best regards,
Mark de Zee, Ph.D., Research Assistant Professor
Aalborg University, Institute of Mechanical Engineering
Pontoppidanstraede 101, Aalborg East,9220 Denmark
Phone: +4596359317, Fax: +4598151675
E-mail: mdz@ime.auc.dk
Homepage: http://www.ime.auc.dk/~mdz/
The AnyBody Group: http://anybody.auc.dk
Karl Cooke wrote:
>Dear group,
>
>I have just joined this group after coming across a paper by Zee et
>al. (2003). I am preparing a research project to determine the effect
>of the mechanics of the pelvis on lumbar spine mechanics during
>running gait. Before I spend time learning the anyscript language,
>can anyone tell me if the lumbar spine model is complete? And
>what parameters may be inputted into the present spine model?
>
>Many thanks for your help in advance, best wishes,
>
>Karl Cooke
>
>
>Karl Cooke
>Human Performance Laboratory
>School of Health & Social Sciences
>Middlesex University
>Highgate Hill, London N19 5LW
>United Kingdom
>Tel. +44 (0)20 84114355
>
>
>
–
Mark de Zee, Ph.D., Research Assistant Professor
Aalborg University, Institute of Mechanical Engineering
Pontoppidanstraede 101, Aalborg East,9220 Denmark
Phone: +4596359317, Fax: +4598151675
E-mail: mdz@ime.auc.dk
The AnyBody Group: http://anybody.auc.dk
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