Over vs. Under the Muscle: Breast Implant Placement Explained

Where the implant sits relative to the pectoralis major muscle is one of the most consequential decisions in breast augmentation — arguably as important as size and profile. The choice affects how the result looks, how it feels, how it ages, how it interferes with mammograms, and how it recovers. There's no universally "best" placement — the right choice depends on your anatomy, activity level, and aesthetic goals.

Placement Options

The Case for Over the Muscle (Subglandular)

Advantages: Shorter recovery (no muscle disruption), no animation deformity (the implant doesn't move when you flex your chest), better lower-pole fullness, and a more "augmented" look. Some surgeons argue it's the anatomically natural position — breast tissue sits on top of the muscle, so the implant should too.

Disadvantages: More visible implant edges (especially with thin tissue), higher capsular contracture rates in some studies, more interference with mammograms, and a potentially less natural upper slope.

Best for: Patients with adequate natural breast tissue to cover the implant, those who want a more obviously augmented look, athletes who can't tolerate animation deformity, and patients who prioritize faster recovery.

The Case for Under the Muscle (Submuscular)

Advantages: More tissue coverage over the implant (softer, more natural look), lower capsular contracture rates in many studies, less interference with mammograms, and a more gradual upper-slope transition.

Disadvantages: Longer and more painful recovery (muscle is partially detached), animation deformity (the implant moves when you flex your pectorals — noticeable in some patients), and potential "bottoming out" over time as the muscle lifts the implant.

Best for: Thin patients with limited natural tissue, patients prioritizing a natural look, those less concerned about animation deformity, and first-time augmentation patients.

Dual Plane: The Middle Ground

Dual plane is the most commonly used placement worldwide — and for good reason. The upper pole of the implant sits behind the pectoralis (providing muscle coverage where the implant is most visible), while the lower pole sits behind breast tissue only (allowing natural lower-pole expansion). This combination captures most of the benefits of submuscular placement while reducing animation deformity and allowing a more natural lower breast shape.

There are three "levels" of dual plane, with increasing amounts of muscle release from the lower breast tissue. Your surgeon selects the level based on your degree of breast ptosis (droop), tissue quality, and desired outcome.

Which Fits Your Body?

Colombian Surgeon Preferences

Colombian plastic surgeons are experienced with all placement options, and most high-volume augmentation surgeons have strong opinions about which techniques they prefer based on their training and outcomes data. In Medellín and Bogotá, dual-plane placement is the most commonly recommended approach for international patients — it's versatile, well-studied, and produces reliable results across a range of body types.

During your consultation (in-person or virtual), your surgeon should explain their placement recommendation based on your specific anatomy, not a one-size-fits-all policy. A surgeon who places every implant in the same position regardless of the patient's body type is applying a protocol rather than practicing individualized medicine.

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