Thank you for your question. You have deflated breasts which has clearly lost volume. An implant is a device that restores volume. It requires a specific pocket either above or below the muscle to be placed. This would add volume, however, would also stretch and potentially thin the skin envelope that surrounds it. This would lead to likely implant irregularities that could be felt and possibly even seen.
An implant does not lift a breast. The concept called a swing effect does move the breast envelope forward and up, not unlike the hand on a clock going from 6 to 8, however, over time with the added weight and stretching of the skin, the breast unit may fall back to its original position. Although a mastopexy would help reduce the skin envelope and improve your breast contour, this would be a skin reduction procedure that would be in opposition to an implant which stretches the breast. Obviously the larger the implant the more likely you are at risk for irregularities.
One final option would be to consider using fat grafts transferred from one part of the body to the breast in order to further enhance the contour and add padding to the breast. Please see the video below to further give you an idea of how this may work. I would certainly discuss this with your plastic surgeon. I hope this helps and have a wonderful day. Dr. Kayser - Detroit