Hi !
I would have a question regarding the output of the AnyForceSurfaceContact function. I use it to compute contact between humeral head and glenoid components of a total shoulder arthroplasty.
The two parameters for which I would have question are the ContactArea and the COP. I understand, after reading the reference manual, that :
- ContactArea refers to the area of contact between the two surfaces.
- COP refers to the Center of Pressure in global coordinates frame.
Using a Camera I got the contact area in pictures for each step of my movement. I defined the camera to look at my glenoid surface :
- the EyePoint is positioned at a node corresponding to the position of the humeral head center and oriented with the same axis than my glenoid axis
- the LookAtPoint corresponds to the center of my glenoid axis
- the UpPoint is a point defined on the superior part of my glenoid vertical axis.
My idea was that I would be able to combine the contact area pictures (obtained by my camera) with the COP (drawn with matlab in the glenoid coordinate system). But, of what I saw, the COP is not at the center of my contact area, what I found strange.
My hypothesis is that the COP depends not only on the contact area but also on the forces applied at each vertex of the contact area. Am I right ? If yes, how to get forces (Fc) at each vertex ? Would it be also possible to draw/show an array to picture the direction of the total force (F, applied at the COP) ?
Thank you for your help !
Best regards,
Lauranne