View Full Version : Upper torso modeling

Adrian Morphett
07-25-2000, 04:39 PM
Dear subscribers,

Recently I posted a query regarding measuring the upper limbs of the human
body using an Ascension Flock of Birds for the purpose of recording human
motion. I was seeking information regarding the estimation of the centre's
of rotation of the upper limbs. Below is my original posting and all
responses. Thank you to all that replied, the information given has been
extremely beneficial.


Adrian Morphett

Swinburne University of Technology
School of Engineering and Science
MB 38
John St
Australia 3122

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I am seeking information on modeling the upper limbs of the human body. I
have an Ascension Flock of Birds and wish to use it to record human motion.
I am having difficulty in accurately determining the location of joint
centres and the axis of rotation. Specifically, I am looking at the cervical
spine, the shoulder, the elbow and the wrist.
I have ample literature on how these joints work, the rotation axis and how
these axis were determined. I cannot however find information on relating
these joint centres to known anatomical locations. Is there some standard
that is used in biomechanics laboratories for linking motion capture data to
specific joint angles? For instance, measure known anatomical locations
which will estimate the joint centres, use this data as offsets to the
sensor locations and then you have the joint centres in relation to the
sensor. With this information, the joint angles can be determined from the
sensor data (I hope!). Or another example: measure anatomical locations on
the shoulder complex and elbow and determine the long axis of the humerus -
can this be done?

I'm not sure if I'm asking a very simple question here, but any information
will be appreciated.


Adrian Morphett

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Dear Adrian,

Skill Technologies, Inc. has written motion capture, kinematic and
anatomical modeling software for the Ascension and Polhemus tracking
systems. Please visit our web site. See web address below.

Dr. Robert Neal of the University of Queensland has our 6D-RESEARCH system
software and 3D-GOLF analysis system.


Stephen Cheetham
VP Sales and Marketing.

1202 E. Maryland Ave. Ste. 1G Phoenix Arizona. USA 85014
Tel: (602) 277-7678
Fax: (602) 277-2326
Email: skill@skilltechnologies.com
Email: stephen@skilltechnologies.com
Web Page: http://www.skilltechnologies.com

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From: "Gideon Ariel"