I am Thin but I Want Subglandular Implants. Is This a Bad Idea?

Although the standard thinking about breast implant placement is limited to over or under, there are really 4 options. The traditional under muscle placement, called "dual plane," does involve cutting the muscle off of its attachment to the ribs, which can lead to a number of problems. Another option is a split-muscle technique, which preserves all of the muscle's natural attachments and function while covering the upper part of the implant where it is most beneficial. Over-muscle placement can be done with a subfascial technique, which doesn't add much in the way of coverage but can add support and is useful in some situations. We use the subfascial and split muscle options a lot in athletic patients, who are often thin and muscular.

If you are very thin, you are probably better off having the implants placed in a biplanar pocket( partial submuscular).  It will help minimize the risk of rippling in the upper portion of the breast.