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Dear All,
concerning recent discussion about inverse dynamic I would like to ask the following. How do we actually validate accuracy of kinetic parameters (force, moments, power etc.) obtained through the inverse dynamic calculation? What is used as a 'golden standard' ? Namely, inverse dynamic output basically relay on two input sources.
Firstly, kinematic parameters acquired usually by the means of 3D kinematic reconstruction systems. I have seen many papers arguing the accuracy of the reconstructions systems themselves and some papers discussing the accuracy of joint center determination against some golden standard (e.g. 'roentgen stereophotogrammetry). Here, the hip arises as significant challenge and generally skin effect imposed on marker setup.
Second input comes from so called BSP parameters calculation (m, I, CM, V, r). In this cases people again tested their body models and corresponding BSPs against some golden standards (e.g. CT, MRI, gamma mass scanning, DXA (dual energy X ray absompthometry), pendulum method etc.).
However, is there any way to validate the actual numbers for force, moments and/or power exercised at specific joint using some other golden standard? Or the best we can do is to relay on accuracy estimation for 3D kinematic systems and BSP, and then analytically predict how the final inverse dynamic calculations accurate will be (including perhaps in our estimation other inherent assumption about inverse dynamic)?
Thank you for your response. Summary will follow later on.
Regards, Tomislav.
Tomislav Pribanic, M.Sc., EE
Department for Electronic Systems and Information Processing
Faculty of Electrical Engineering and Computing
3 Unska, 10000 Zagreb, Croatia
tel. ..385 1 612 98 67, fax. ..385 1 612 96 52
E-mail : tomislav.pribanic@fer.hr
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concerning recent discussion about inverse dynamic I would like to ask the following. How do we actually validate accuracy of kinetic parameters (force, moments, power etc.) obtained through the inverse dynamic calculation? What is used as a 'golden standard' ? Namely, inverse dynamic output basically relay on two input sources.
Firstly, kinematic parameters acquired usually by the means of 3D kinematic reconstruction systems. I have seen many papers arguing the accuracy of the reconstructions systems themselves and some papers discussing the accuracy of joint center determination against some golden standard (e.g. 'roentgen stereophotogrammetry). Here, the hip arises as significant challenge and generally skin effect imposed on marker setup.
Second input comes from so called BSP parameters calculation (m, I, CM, V, r). In this cases people again tested their body models and corresponding BSPs against some golden standards (e.g. CT, MRI, gamma mass scanning, DXA (dual energy X ray absompthometry), pendulum method etc.).
However, is there any way to validate the actual numbers for force, moments and/or power exercised at specific joint using some other golden standard? Or the best we can do is to relay on accuracy estimation for 3D kinematic systems and BSP, and then analytically predict how the final inverse dynamic calculations accurate will be (including perhaps in our estimation other inherent assumption about inverse dynamic)?
Thank you for your response. Summary will follow later on.
Regards, Tomislav.
Tomislav Pribanic, M.Sc., EE
Department for Electronic Systems and Information Processing
Faculty of Electrical Engineering and Computing
3 Unska, 10000 Zagreb, Croatia
tel. ..385 1 612 98 67, fax. ..385 1 612 96 52
E-mail : tomislav.pribanic@fer.hr
-----------------------------------------------------------------
To unsubscribe send SIGNOFF BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://isb.ri.ccf.org/biomch-l
Please consider posting your message to the Biomch-L Web-based
Discussion Forum: http://movement-analysis.com/biomch_l
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