Why is under muscle placement more commonly recommended than over muscle?

When undergoing breast augmentation there are a number of choices which need to be made: saline or silicone? Volume: Larger or smaller? Incision? However, one of the most commonly debated choices is that of implants placement: subglandular/ submammary vs. subpectoral/ submuscular? While many surgeons recommend submuscular placement there are distinct differences to each approach.

Subglandular Augmentation (“overs”):

• Subglandular augmentation means place of the implant underneath the breast tissue but above the pectoralis muscle. Subglandular placement spares the pectoralis muscle which leads to reduced post operative pain/discomfort and no impact on muscle function post augmentation. Recovery is also faster
when compared to subpectoral augmentation.

• Subglandular augmentation can impact mammographic evaluation of the breast. However, as dedicated breast radiography has become more prevalent this has become less of an issue. Fellowship trained radiologists have become familiar with evaluating breasts post augmentation. It is also important to note that implant position does not interfere with visualization of breast tissue via contrast enhanced MRI (the most sensitive and specific study available for breast cancer detection).

• Studies suggest there is an increased risk of capsular contracture when implants are placed in a subglandular space.

• Aesthetically, implants placed superficial to the pectoralis major create a rounded, convex appearing breast profile. This effect is camouflaged, at least initially in larger breasted patients. However, as a woman ages fat atrophies and breast tissue descends. The result is a more noticeable implant specifically in the upper pole. Similarly, patients who have thin coverage superiorly are more likely to be able to perceive the implants and at higher risk of visible rippling.

Subpectoral Augmentation (“unders”):

• Subpectoral augmentation is technically a bit of a misnomer. Traditionally, subpectoral augmentation involves the release of the pecotralis major muscle from its lower attachments. This allows the muscle to “window-shade.” The upper hemisphere of the implant sits underneath the muscle (dual plane). This release contributes much of the discomfort encountered postoperatively by patients.

• Subpectoral implants have a lower rate of capsular contracture.


• Aesthetically, in contrast to submammary implants (which are prominent in the upper pole- especially in thinner patients), the pectoralis muscle both conceals the underlying implant and flattens the upper pole. This flattening effect creates a natural sloping as one proceeds from the upper portion of the implant to the lower portion.

• The most commonly cited drawback to sub-muscular augmentation is the animation deformity associated with contraction of the overlying muscle.

Each approach has both costs and benefits. Patients are unique and so too is each operative plan. A potential augmentation candidate may be better suited for one approach or the other. As always, your board certified plastic surgeon can help guide you in your decision making process.

Thank you for your for asking, subpectoral placement has lower risk of visible rippling especially in individuals with thin breast tissue, and subglandular placement looks more natural, and it behave like a normal breast tissue with time, Ultimately, the choice between subpectoral and subglandular placement should be made based on individual patient factors, including breast anatomy, tissue characteristics, and aesthetic goals. Ensure to discuss these options thoroughly with a qualified plastic surgeon to determine the most suitable approach for achieving the desired outcome.

Thank you for your questions! Subpectoral (under muscle) placement and subglandular (under muscle) placement refer to the placement of breast implants either partially beneath the chest muscle or directly behind the breast tissue. However, subpectoral placement is generally more commonly recommended due to its potential for a more natural look, reduced risk of capsular contracture, and lower risk of visible rippling especially in individuals with thin breast tissue. Ultimately, the choice between subpectoral and subglandular placement should be made based on individual patient factors, including breast anatomy, tissue characteristics, and aesthetic goals. Ensure to discuss these options thoroughly with a qualified plastic surgeon to determine the most suitable approach for achieving the desired outcome.