The Bill Hartman Podcast for The 16% - Season 10 - Number 5 Podcast
So again, you have to decide what the goal is. If we're trying to recapture relative motions, we have to manage things like direction, magnitude, position, et cetera. So if the force is outside of my base of support, that's beyond where I have access to relative motion. Okay. So when we talk about, excuse me, we talked about capturing the early foot and that would be medial heel contact, first metatarsal head. That's where we start to superimpose the internal rotation on the external rotation. So that is a demonstration of relative motions where both of them exist at the same time in that representation. If I was to stay on the outside edge of the foot and never capture the medial aspect of that foot, that would be an orientation into external rotation with no internal rotation available.
relative motionbase of supportfoot mechanicsinternal rotationexternal rotation