Skin and the tissue underneath it are somewhat stretchy. They have to be to, say, let you bend your joints etc without having the skin get stuck and stopping you from bending things further. In addition, part of the surgery is releasing some of the attachments between the overlying skin/fat (or muscle) and the tissue underneath to create a space for the implant to go. This allows for much more movement and space for the implant to go in. However, it’s doesn’t create unlimited room, so plastic surgeons have to be careful about how large of implants can be fit. If needed, they can put in temporary implant spacers that can be filled with more and more fluid over time. The skin can then stretch more, allowing larger permanent implants to be put in later.
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