What Does “Half Under the Muscle” Mean in Breast Augmentation?

Recently, a high-profile celebrity made headlines by revealing she had her breast implants placed “half under the muscle.” This sparked a wave of curiosity—what does that actually mean? Is it a real technique? And if so, when is it used?

What Does “Half Under the Muscle” Really Mean?

The term “half under the muscle” isn’t technically incorrect—it’s just not the term we use in the operating room. The correct medical term is dual plane breast augmentation.

It’s a type of under the muscle implant placement, meaning the implant is placed underneath the pectoralis major (chest) muscle—but there’s a little more to it than that.

Here’s what actually happens in a dual plane procedure:

• The implant is placed beneath the chest muscle, just like in standard submuscular augmentation.
• With most under the muscle breast implant placements, part of the lower edge of the muscle is released.
• This release allows the implant to slide downward and fill out the lower breast more naturally—especially helpful for patients with a tight or constricted lower pole.
• What makes a dual plane approach different is that in addition to releasing part of the muscle, we also release some of the breast tissue off the muscle.
• This helps the breast tissue and nipple to “slide up” slightly, creating a more lifted appearance without performing a formal lift.
• So two planes (i.e. dual planes) are created surgically.

So while it’s true that part of the implant ends up without full muscle coverage, the entire implant is still beneath the breast tissue.

Why is the Dual Plane Technique Used?

There are a couple of reasons why a plastic surgeon might recommend a dual plane technique:

1. Mild Low-Set Nipple Position

In women whose nipples sit slightly lower on the breast mound—but not so low as to require a full breast lift—the dual plane technique can provide a modest lift. Separating the breast tissue from the muscle allows the tissue to slide upward slightly, improving nipple positioning without additional incisions.

2. Tight Lower Pole or Constricted Breast Shape

Some patients, especially those with naturally smaller or tuberous breasts, may have a tight lower pole—the lower portion of the breast that doesn’t stretch easily. Dual plane placement helps release this tightness and allows for better implant positioning and a more natural contour.

So… Is “Half Under the Muscle” the Same as Dual Plane?

The phrase “half under the muscle” is simply a layperson’s way of describing what surgeons call dual plane augmentation.

Is This Right for Everyone?

Not necessarily. The ideal implant placement depends on your anatomy, skin elasticity, breast volume, and surgical goals. During your consultation, we’ll evaluate your breast shape, nipple position, and skin envelope to determine which implant plane and technique is best for you.

Curious if you’re a candidate for dual plane augmentation?

If you’re considering breast augmentation and want personalized advice—not internet myths—I’m here to help.

-Dr. Victoria Aimé