CoRCTT

CoR Estimation Algorithm (Centre Transformation Technique)

Joint centre calculation by one sided centre transformation technique.

Attributes

Attribute Description Required
name
name of the element

Yes
basisCoordinateSystem
Yes
movingCoordinateSystem
Yes
condition
if set to a mathematical formula which is 1 or 0 it is used instead of defined events

No

Requirements

Two adjacent segment coordinate systems must be defined.

Generated Trajectories

Name of trajectorie Description
<name>Origin
Centre of rotation timeserie in global lab coordinates.
<name>Condition
Typically only internal used: A double with the value 1 or 0 for each frame. It is set to 1 if the frame is used for the estimation else 0.

Generated Parameters

Name of parameter Description
<name>FramesCount
Number of frames used for the estimation and defined by the condition.
<name>Radius
Distance from the origin of the moving segments coordinate system to the estimated centre of rotation.
<name>RadiusStd
Standard deviation of the posthoc radius defined by all the frames used for the estimation
<name>OriginLocal
The centre of rotation in local coordinates of the adjacent segments coordinate system.

Name of parameter	Description
<name>FramesCount	Number of frames used for the estimation and defined by the condition.
<name>Radius	Distance from the origin of the moving segments coordinate system to the estimated centre of rotation.
<name>RadiusStd	Standard deviation of the posthoc radius defined by all the frames used for the estimation
<name>OriginLocal	The centre of rotation in local coordinates of the adjacent segments coordinate system.

References

[Ehrig 2006] A survey of formal methods for determining the centre of rotation of ball joints, Rainald M. Ehrig, William R. Taylor, Georg N. Duda, Markus O, Heller, Journal of Biomechanics 39 (2006) 2798-2809.

Examples

 <CoRCTT name="RGJC"
 condition="RAbdukAngle<30.0"
 movingCoordinateSystem="move"
 basisCoordinateSystem="basis"/>

Attribute	Description	Required
name	name of the element	Yes
basisCoordinateSystem		Yes
movingCoordinateSystem		Yes
condition	if set to a mathematical formula which is 1 or 0 it is used instead of defined events	No

Name of trajectorie	Description
<name>Origin	Centre of rotation timeserie in global lab coordinates.
<name>Condition	Typically only internal used: A double with the value 1 or 0 for each frame. It is set to 1 if the frame is used for the estimation else 0.