Just wondering what you mean by Head, Collar, and Pelvis. Is Head the top of the head or bottom of the head? The same applies for Pelvis and Knee. Also, is Collar the clavicle or manubrium (yes, I have a book on anatomy in front of me).
I'm not very good with anatomical terms, but I'll try to explain the points I was using:
"Head" = crown (highest point standing up)
"Collar" = clavicle (collar bone), at the center groove/hole. (Below the adam's apple)
"Pelvis" = lowest point of pelvis/crotch/butt standing up. The bottom of the "V".
"Knee' = center of knee cap.
"Heel" = base where one would stand.
"Elbow" = middle of the elbow, at the tip of the bone
"Wrist" = anywhere along the wristline, but usually the side with the shortest distance from the elbow point on the pic.
"Ftip" = tip of middle finger (usually projected, as most poses aren't open-handed.)