Breast Implant Placement: Above or Below Muscle
Breast implants can be placed above the chest muscle, partly below it, or in another carefully defined tissue plane. No pocket is best for every patient. Existing tissue, implant dimensions, breast position, activity, prior surgery, and the desired contour all affect the choice.
Above the muscle
A subglandular pocket places the implant behind breast tissue and in front of the pectoralis muscle. This avoids muscle movement over the implant. It also relies more on the person's own tissue to cover the implant, which can affect visibility, palpability, rippling, and edge transition.
Partly below the muscle
A subpectoral or dual-plane plan places at least part of the implant behind the pectoralis muscle. Added coverage can be useful in selected anatomy. Muscle contraction can also move or distort the implant, and the operation may create different discomfort and activity considerations.
The pocket cannot be chosen alone
Placement interacts with implant width, profile, fill, surface, incision, breast tissue, skin, nipple position, and chest shape. A pocket that fits one implant and goal may not fit another. Prior augmentation, lift, reconstruction, chest-wall differences, or strong pectoral muscle activity may change the plan.
All pockets retain implant risks
Placement does not remove the risks of capsular contracture, rupture or deflation, pain, changes in sensation, infection, malposition, visible rippling, additional surgery, or implant-associated cancers. Breast implants are not lifetime devices. Ask how the pocket could affect examination, mammography positioning, future imaging, and revision options.
Questions for the consultation
How much natural tissue will cover the proposed implant?
How could muscle movement affect the contour?
Why does this pocket fit the implant dimensions and my goals?
How might placement affect exercise, imaging, and a future revision?
What tradeoffs would the other pocket create?
The FDA breast implant overview explains long-term device risks. Read the breast augmentation service guide for the complete planning framework.