I have 12 year old implants. Both ruptured! I am looking to go for a second surgery for removal and replacement. I have round & behind the muscle at the moment. I was thinking of changing to teardrop (only as I am a little older now and think they might suit my age better) but I'm worried about the idea of them rotating or flipping and also would a teardrop implant fill the gap where a round implant has been?