Where to place breast implants — under the chest muscle or over it — remains more a plastic surgeon’s choice. It’s an important discussion, in particular, for thinner, very active women, who sometimes complain that implants move inappropriately when they exercise. In plastic surgery, this is an issue known as “distortion.”
Here one doctor provides some clarity on why he and many other doctors prefer to place implants under the chest muscle. https://niume.com/post/247372https://niume.com/post/247372.
For more discussion on implant placement, see our book’s breast implant chapter. It discusses types of implants; problems; placement concerns and other issues.