Gravity affects objects of equal mass equally. This is a law of physics. So, it's not really the shape of the implant - high profile saline vs. anatomic implant - that leads to the implant moving lower. It's just gravity.
Over time, any and all breast implants will descend on the chest wall. This is true of natural breast tissue as well. Over time, natural breast tissue and breast skin will stretch, settle, and become ptotic. Gravity sucks.
An anatomic implant may move less in that these are often textured. The textured implants tend to "stick" in the position where they are placed. The textured surface that helps keep the anatomic implant from turning sideways - (just picture that teardrop shape sideways on your chest) - may help to keep it stuck to the chest wall so that it doesn't descend as much. This is just a theory though and I don't think there is any scientific evidence to support it.
So, what I'm trying to say is that either implant will provide you with a good result provided that you have a good surgeon. I prefer the round implants over the "shaped implants" except in select situations because of the fact that they can move and rotate.
