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I have been re-analyzing some of Braune and Fischer's work (based on the
English translation done by Macquet and Furlong) and have had some difficulties
recreating some of their results. I was wondering if anyone in the biomechanics
community had gone through their equations in detail and could offer any insight
into Braune and Fischer's classic work. [As an aside, I know Herman Woltring
once published something on this topic---I think he tried to calculate helical
axes for the knee, but found the data to be too noisy for this purpose. If anyone
has Woltring's abstract or newsletter report, I would appreciate knowing the
reference.]
In particular, I have been checking the derived values for z1 and z2 for the head
marker from the left and right sides. ("z" points upwards, and "1" and "2" refer to two
ways of calculating z.) In addition, I have restricted the results below to "Experiment
II" performed on the night of July 24th, 1891.
The results from cameras on the right for frame number 11 reported in the translation
I have are listed in Braune and Fisher's Table 8
z1 : 75.21
z2 : 75.19
Our calculations based on Equation 27 yield the following for the 11th frame:
z1 (from the right) : 75.34
z2 (from the right) : 61.08
z1 (from the left) : 74.83
z2 (from the left) : 60.03
The results from cameras on the right for frame number 20 reported in the translation
I have are listed in Braune and Fisher's Table 8
z1 : 78.87
z2 : 78.83
Our calculations based on Equation 27 yield the following for the 20th frame:
z1 (from the right) : 79.33
z2 (from the right) : 62.93
z1 (from the left) : 77.74
z2 (from the left) : 60.89
So my questions are:
1. Is Equation 27 in the translation exactly the same as in the original?
2. Has anyone found any mistakes in either the original or the translation?
3. Does anyone know where my mistake may be?
Many thanks,
Brian Davis
davis@bme.ri.ccf.org
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English translation done by Macquet and Furlong) and have had some difficulties
recreating some of their results. I was wondering if anyone in the biomechanics
community had gone through their equations in detail and could offer any insight
into Braune and Fischer's classic work. [As an aside, I know Herman Woltring
once published something on this topic---I think he tried to calculate helical
axes for the knee, but found the data to be too noisy for this purpose. If anyone
has Woltring's abstract or newsletter report, I would appreciate knowing the
reference.]
In particular, I have been checking the derived values for z1 and z2 for the head
marker from the left and right sides. ("z" points upwards, and "1" and "2" refer to two
ways of calculating z.) In addition, I have restricted the results below to "Experiment
II" performed on the night of July 24th, 1891.
The results from cameras on the right for frame number 11 reported in the translation
I have are listed in Braune and Fisher's Table 8
z1 : 75.21
z2 : 75.19
Our calculations based on Equation 27 yield the following for the 11th frame:
z1 (from the right) : 75.34
z2 (from the right) : 61.08
z1 (from the left) : 74.83
z2 (from the left) : 60.03
The results from cameras on the right for frame number 20 reported in the translation
I have are listed in Braune and Fisher's Table 8
z1 : 78.87
z2 : 78.83
Our calculations based on Equation 27 yield the following for the 20th frame:
z1 (from the right) : 79.33
z2 (from the right) : 62.93
z1 (from the left) : 77.74
z2 (from the left) : 60.89
So my questions are:
1. Is Equation 27 in the translation exactly the same as in the original?
2. Has anyone found any mistakes in either the original or the translation?
3. Does anyone know where my mistake may be?
Many thanks,
Brian Davis
davis@bme.ri.ccf.org
-------------------------------------------------------------------
To unsubscribe send UNSUBSCRIBE BIOMCH-L to LISTSERV@nic.surfnet.nl
For information and archives: http://www.bme.ccf.org/isb/biomch-l
-------------------------------------------------------------------