Explainer · August 2, 2026 · 5 min · By Tariq Mehmood
Over or Under the Muscle: How Los Angeles Surgeons Decide Implant Placement for Athletic Patients
Animation deformity, capsular contracture risk, and soft tissue coverage all pull in different directions. Here is the actual decision logic behind dual plane, subglandular, and subfascial placement, without the marketing gloss.
Ask ten patients researching breast augmentation in Los Angeles what "under the muscle" means and most will describe it as the premium option, the one careful surgeons prefer. The reality is more conditional. Implant placement is a tradeoff between three competing variables: soft tissue coverage, capsular contracture risk, and muscle interaction. For the large population of LA patients who lift weights, do Pilates reformer work, practice yoga, or train seriously, that third variable matters more than most consultations acknowledge.
The three main pockets, defined plainly. Subglandular placement puts the implant behind the breast gland but on top of the pectoralis major muscle. Submuscular and dual plane placement put the upper portion of the implant behind the pectoralis major, with dual plane, the most common technique in the United States today, releasing the lower muscle attachments so the bottom of the implant sits under gland only. Subfascial placement is a middle path: the implant sits above the muscle but beneath the pectoral fascia, a thin fibrous layer that adds a modest amount of support and camouflage.
Why the muscle helps. The pectoralis major provides two mechanical benefits. First, it adds several millimeters of living tissue over the upper pole of the implant, which softens the transition from chest wall to breast and reduces visible rippling in thin patients. Second, multiple large series have associated submuscular placement with lower rates of capsular contracture, the scar tightening that can make a breast feel firm or look distorted. The proposed mechanisms include better vascularized coverage and possibly the constant micro massage of muscle movement, though the exact cause is still debated in the literature.
Why the muscle also causes problems. The pectoralis major exists to move the arm across the chest. When it contracts over an implant, it compresses and displaces it. In most patients this is invisible in daily life. In patients with well developed pectoral muscles, or those who flex frequently during training, it produces animation deformity: the breast flattens, shifts laterally or upward, and can develop a visible ridge with each contraction. Over years, repeated contraction can also push implants outward toward the armpit, widening the gap between the breasts. For a competitive lifter, a dancer, or anyone whose profession involves being photographed while active, this is not a cosmetic footnote.
The dual plane compromise. Dual plane technique was designed to split the difference. By releasing the muscle's lower attachments, the surgeon lets the implant expand the lower breast naturally while keeping muscle coverage where thin skin needs it most, in the upper pole. It reduces some distortion compared with full submuscular placement, but it does not eliminate animation, because the upper implant still sits under contracting muscle.
Where subfascial placement fits. For patients with adequate natural breast tissue, roughly two centimeters or more of pinch thickness in the upper pole, subfascial placement avoids the muscle entirely. No animation deformity, typically less early postoperative pain, and a faster return to upper body training, often two to three weeks rather than four to six. The tradeoffs are real: thinner coverage means higher odds of visible implant edges or rippling in lean patients, and some studies suggest a modestly higher capsular contracture rate than submuscular pockets, though modern cohesive gel implants and careful technique have narrowed that gap.
The screening question that actually matters. A useful consultation should include a simple test: the surgeon asks you to press your palms together at chest height while they watch and palpate your upper pole tissue. This does two things at once. It reveals how strongly your pectoralis contracts, and the pinch test measures whether you have enough tissue to hide an implant without muscle coverage. A very lean patient with under two centimeters of upper pole pinch is usually steered toward dual plane despite athletic goals, because visible rippling is harder to correct later than animation is to tolerate. A patient with moderate natural tissue and heavy training habits is a genuine candidate for subfascial or subglandular placement.
Common myths worth retiring. First, submuscular does not mean the implant is fully behind muscle. In nearly all modern techniques the lower third of the implant has no muscle over it. Second, placement does not determine size limits by itself. Base width of your chest and tissue elasticity constrain implant dimensions far more than pocket choice. Third, above the muscle does not automatically look fake. In patients with sufficient tissue, subfascial results can be indistinguishable from dual plane at rest, and better looking in motion.
Questions to bring to any consultation. How many millimeters of upper pole pinch do I have, and does that support placement above the muscle? What is your revision rate for animation deformity versus rippling? If I return to heavy pressing exercises, how do you expect the pocket to behave at five years, not five months? A surgeon who answers those in measurements and mechanisms, rather than preferences and reassurance, is giving you the information the decision actually requires.