Ligaments in the shoulder girdle and shank

Hi guys,

  1. Question: I am wondering why you used some kind of a complex model
    of muscles and drivers to model the trapezoid and conoid ligament,
    connecting the clavicula and scapula, although you have a ligament
    model in anyscript. Can you give me any more information except the
    comments in the code?

  2. Question: Do you think it would make sense regarding loading and
    unloading of the muscles, if you model the big ligament constructs
    connecting the tibia and fibula (Membrana interossea cruris) or radius
    and ulna (Membrana interossea antebrachii)?

Thanks for your help,

Best regards,

Alex

Hi Alex

The force in the ligaments comes from the kinematics, which is always
prescribed in these kinds of models. So to make good use of ligaments it
becomes very important that both the kinematics and the ligament properties
are correct. Otherwise unrealistic forces will be introduced into the
system. In reality when the muscles create a force, some of the ligaments
will be longer and the force will change. This contribution you will not be
able to see in the model since the motion is prescribed.

Q1: Ligaments can be hard to find the proper data for, i think this is why
these ligaments where constructed in this way. We wanted to have only the
pulling force in these connections that why they are created as muscles.

Q2: We have tried to account for these ligaments in the way the joints are
created between radius and ulna, these joints prevents sliding along the PS
axis between radius and ulna. It is actually the same for other joints such
as the knee where the moment reactions account for the load carried by the
missing ligaments.

I hope this made it clearer …

Best regards

Søren, AnyBody Support


From: anyscript@yahoogroups.com [mailto:anyscript@yahoogroups.com] On Behalf
Of noltealexander
Sent: 26 May 2008 17:16
To: anyscript@yahoogroups.com
Subject: [AnyScript] Ligaments in the shoulder girdle and shank

Hi guys,

  1. Question: I am wondering why you used some kind of a complex model
    of muscles and drivers to model the trapezoid and conoid ligament,
    connecting the clavicula and scapula, although you have a ligament
    model in anyscript. Can you give me any more information except the
    comments in the code?

  2. Question: Do you think it would make sense regarding loading and
    unloading of the muscles, if you model the big ligament constructs
    connecting the tibia and fibula (Membrana interossea cruris) or radius
    and ulna (Membrana interossea antebrachii)?

Thanks for your help,

Best regards,

Alex

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