While not very common, I think any time breast implants are being put in, there should be a concern about bottoming out. Not because we expect it or see it frequently, but because it CAN happen, and we should take as many measures as possible to prevent it. I'm in agreement with my many colleagues who have already stated that the size of the implants is a factor - larger implants have a greater risk of bottoming out as they impart more force on the tissues. However, that doesn't mean that we shouldn't use large implants, again, we just need to take proper precautions when we do. I respectfully disagree with those who have stated that texturing has no effect on the movement of implants. While it may not be the most important factor, I think texturing of implants creates a certain degree of "friction" against the tissues, and this can help to keep the implants in place, whether we are talking about rotations about the x, y, or z axes, or lateral or up and down movements. It is pretty well recognized that texturing helps minimize implant mobility, in addition to decreasing the risk of capsule contracture. There are many different types of texturing processes depending upon your implant manufacturer, and I'm sure you have different options "Down Under" than we do in the States, so I would defer to your surgeon regarding the specifics of those options. I personally believe that the most important factor involved with bottoming out is a combination of the patients's anatomy and how the surgeon deals with that technically. Most of the time when implants bottom, there has been some manipulation of the inframammary fold below the breast. Especially in cases like yours in which large implants are being inserted and the fold must be lowered to maintain proper proportions and perspective on the breast mound. The fat layer below the skin and above the muscle is divided into two separate compartments - one deep and one more superficial, and there is a layer of fibrous tissue called "superficial fascia' separating these two compartments of the fat. The superficial layer is usually tougher and resists downward forces, but the deeper layer is more filmy and flimsy, and in some people it is weaker than others. Those would be the people most prone to bottoming out. If this deep layer of fat is opened and not managed properly, and a large object like a breast implant is placed above that opening, it may not have enough strength to resist gravity and other downward forces, and the implant can "slide down behind" that deep layer of the fat. That is what we recognize as "bottoming out." I have confirmed this anatomically on multiple occasions by simply sliding my finger down into this flimsy deep layer of fat without much difficulty. Thus, when the fold is to be lowered, and especially when using a large implant, and especially a large smooth implant, the surgeon must take measures to control that opening in the deep layer of fat, or there will be a risk of bottoming out. He or she must close that layer in some manner reliably enough to prevent the bottoming out. Detailed technical descriptions of how that is done I think are beyond the scope of this forum or this answer, just know that your instincts are correct in your question, and this is an issue to be discussed further with your surgeon. If he or she would like to discuss this with me, for what that may be worth, surgeon to surgeon, I would be most happy to share what I know and have learned about this issue from my mentors before me as well as my own experience (bad and good!), and you are welcome to put him or her in touch with me. Otherwise, I wish you the best of luck with your upcoming procedure!