Over, Under, or In Between: How Implant Placement Actually Works, and Why Los Angeles Surgeons Talk About Dual Plane So Much

Ask ten prospective patients in Los Angeles what implant they want and most will answer with a size or a brand. Ask ten board-certified plastic surgeons what matters most for a natural, durable result and a large share will say the same word: placement. Where the implant sits relative to the pectoralis major muscle changes how the breast looks at rest, how it moves, how it ages, and what complications become more or less likely. This explainer walks through the three main pocket options and the anatomy that drives the decision.

The three pockets, defined. In subglandular placement, the implant sits above the pectoralis major, directly under the breast gland and its fascia. In full submuscular placement, the implant sits beneath the muscle. In dual plane placement, the most common approach in modern American practice, the upper portion of the implant sits under the muscle while the lower portion sits under the gland, because the surgeon releases the muscle's lower attachments to let it ride up. The muscle covers the top of the implant, the gland covers the bottom.

Why coverage matters mechanically. Silicone and saline implants are smooth-edged devices, but the human eye is very good at detecting edges under thin tissue. A patient with minimal natural breast tissue who receives a subglandular implant has only skin and a thin layer of gland between the implant border and the outside world. That is the mechanical basis for visible rippling and a sharply demarcated upper pole, the so-called stuck-on look. Adding muscle over the upper implant softens that transition, because the pectoralis acts as an extra layer of padding exactly where the implant edge would otherwise show. This is why surgeons pinch the tissue at the top of the breast during consultation. A pinch thickness under roughly two centimeters generally pushes the recommendation toward muscle coverage.

Why subglandular still exists. Above-the-muscle placement is not obsolete. Patients with generous natural tissue, mild sagging, or heavily developed pectoral muscles can be reasonable candidates. The mechanism behind the last point matters in a city full of gym-focused patients: when an implant sits under an active pectoralis, contracting the muscle compresses and can visibly shift the implant, a phenomenon called animation deformity. Bodybuilders, serious climbers, and some athletes sometimes accept the tradeoffs of subglandular placement to avoid it. Subglandular surgery also tends to involve less postoperative discomfort, since the muscle is not lifted or partially released.

The dual plane compromise. Dual plane exists because full submuscular placement has its own problem. An intact muscle pressing on the lower implant can flatten the lower pole and push the implant upward over time, producing an unnaturally high, tight result. By releasing the muscle's lower border, dual plane keeps padding where the eye needs it, at the top, while letting the implant expand the lower breast naturally. It also allows the implant to sit correctly in patients with mild droop, because the gland can redrape over the lower implant. Surgeons describe dual plane in grades, one through three, based on how much muscle release is performed. More release suits patients with more natural sag.

What the evidence says about complications. Peer-reviewed data over the last two decades consistently associates submuscular and dual plane placement with lower rates of capsular contracture, the scar-tissue tightening that is the most common reason for revision surgery. The leading mechanistic explanation is bacterial: subglandular pockets sit closer to the ducts of the breast, which are not sterile, and low-grade bacterial films on the implant surface are strongly implicated in contracture. Muscle coverage also matters for imaging. Mammography is somewhat easier to interpret with submuscular implants, a point worth raising if you have a family history of breast cancer.

Recovery differences, honestly stated. Because dual plane and submuscular surgery involve elevating muscle, early recovery is more uncomfortable, often described as pressure or a deep workout soreness for the first week. Subglandular recovery is typically faster. Marketing that promises effortless recovery regardless of placement is glossing over anatomy. Ask any surgeon quoting a rapid timeline which pocket they plan to use and why.

How to use this in an LA consultation. The Los Angeles market is crowded and competitive, which cuts both ways: high surgeon experience, but also aggressive marketing. A useful consultation should include a tissue pinch test, a discussion of your muscle use and athletic habits, an assessment of any existing sag, and a specific recommendation with reasoning. If a surgeon recommends a pocket without examining your tissue thickness, or presents one placement as universally superior, treat that as a signal to seek a second opinion. Placement is a matching problem between your anatomy and the device, not a menu item. The right question is not which pocket is best, but which pocket is best for the tissue you actually have.

Related reading: Over, Under, or Dual Plane: How Implant Placement Actually Changes Your Result.