Breast Implant Malposition: Bottoming Out, Symmastia, Lateral Drift, and the Double Bubble, Why 'the Implant Moved' Almost Always Means the Pocket Failed, and What a Revision Can Honestly Fix

Breast implant malposition is the umbrella term for an implant that sits in the wrong place: too low, too far to the side, too close to its partner across the chest, or too high above a fold that no longer lines up with it. Patients almost always describe it the same way, as "the implant moved," and the phrasing quietly assigns the blame to the device. In practice, a smooth or textured shell filled with saline or silicone gel has no intentions. It settles into whatever space the surgeon created and whatever the surrounding tissue permits over time, and nearly every form of malposition is a story about that space, the pocket, rather than about the implant inside it.

That distinction is not pedantic. It determines whether the problem was set in motion on the day of surgery or developed years later, whether swapping the implant will help or make it worse, and whether a revision is a modest tightening of an existing pocket or a full reconstruction of it. Malposition is also consistently among the leading reasons for reoperation reported in the manufacturers' premarket core studies submitted to the Food and Drug Administration, alongside capsular contracture and size change, which makes it one of the most common revision conversations in breast surgery rather than a rare misfortune.

This piece works through the four main patterns (bottoming out, lateral displacement, symmastia, and the high-riding implant with its double bubble), what actually causes each, and what a repair can and cannot promise.

What breast implant malposition actually is, and why the pocket rather than the implant is the problem

The short answer: malposition means the implant pocket is the wrong size, shape, or position for the implant and the breast, either because it was dissected that way or because tissue stretched after surgery, and the implant simply fills whatever space it has been given.

During an augmentation, the surgeon creates a pocket either above the chest muscle (subglandular), partly beneath it (the dual-plane subpectoral approach), or, increasingly, above the muscle again in the modern prepectoral sense described in the piece on how implant placement quietly changed. The pocket has four borders that matter: the inframammary fold below, the lateral border toward the armpit, the medial border near the breastbone, and the upper pole. Over the following weeks, the body forms a capsule of scar tissue around the implant, and that capsule becomes the practical boundary of the pocket for as long as the implant stays in.

Every malposition is a failure of one of those borders. A pocket dissected too low, or a fold lowered further than the tissue can hold, produces bottoming out. A pocket opened too far laterally produces lateral drift. A pocket dissected across the midline, or muscle released too far toward the breastbone, produces symmastia. A pocket left too small or tightened by contracture holds the implant high while breast tissue descends in front of it. The implant choice matters too, but mostly through the mismatch: an implant wider than the patient's own breast base, or heavier than the patient's tissue can support, will test every border at once, which is the argument made in the piece on how surgeons decide implant size.

A separate problem is often lumped in: animation deformity, where the breast distorts when the chest muscle contracts. It is a dynamic cousin of malposition rather than a true one, because the implant sits in the right place at rest and is pulled out of it only when the pectoralis fires. It belongs to the choice of plane, and it is one of the main reasons the prepectoral pendulum swung back.

Bottoming out: why the implant sinks below the fold, and why it is often decided in the consultation

The short answer: bottoming out happens when the implant descends below the intended inframammary fold, lengthening the lower pole so the nipple appears to sit too high and point upward, and the usual causes are a fold lowered more than the tissue could hold, an implant too large or heavy for the patient's tissue, or thin, stretchable skin that gave way over time.

Lowering the fold is a routine and legitimate step. A small breast with a short distance from nipple to fold often cannot accommodate an implant of useful size without it, and surgeons who follow tissue-based planning systems map the fold position to the implant's width. Under the widely taught tissue-based approach, a stretched nipple-to-fold distance of roughly 7 centimeters corresponds to an implant of around 200 cubic centimeters, rising by roughly half a centimeter for every additional 50 cubic centimeters, so a 400 cubic centimeter implant expects a fold around 9 centimeters from the nipple. The purpose of that arithmetic is to put the fold exactly where the lower edge of the implant will live. Lower it further, and the implant keeps going.

The fold itself is not simply a crease. It is a band of dense connective tissue that anchors the skin to the chest wall, and once a surgeon releases it, it has to be recreated by healing in the right place. Heavy implants, smooth shells that slide more easily than textured ones, subglandular placement where no muscle supports the lower pole, and patients with poor skin elasticity (after significant weight loss, after pregnancy, or with visible stretch marks) all put more load on that reconstructed boundary. The pattern is familiar in revision practices: a patient who asked for a size the tissues could not support, a surgeon who agreed, and a result that looked excellent at three months and gradually lengthened over two or three years. The long-term behavior of the lower pole is also why a breast that needed a lift before augmentation, as covered in the comparison between a breast lift and augmentation, is so prone to this when an implant is used as a substitute for one.

Bottoming out also needs to be distinguished from normal settling. Implants are expected to drop and soften over the first several months as swelling resolves and the lower pole stretches to accept them, on the timeline laid out in the piece on swelling after plastic surgery. The practical line is the scar: an inframammary incision that was placed in the fold and now sits on the underside of the breast, well above the lowest point of the implant, is a sign the implant has passed the boundary rather than simply settled against it.

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An implant does not travel. It fills the space it was given and the space the tissue later surrenders, and a revision that changes the implant without rebuilding that space is usually a revision that will be repeated.

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Lateral displacement and symmastia: the drift toward the armpit and the implants that meet in the middle

The short answer: lateral displacement is an implant that falls toward the armpit, most obvious when lying down, usually because the outer pocket was over-dissected or the tissue stretched, while symmastia is the reverse, implants that cross toward or over the breastbone so the cleavage becomes a single continuous mound, almost always because the inner pocket was dissected too far toward the midline.

Lateral drift is the more common and the more forgiving of the two. Some outward movement on lying flat is normal, particularly with softer implants in a subglandular or prepectoral pocket, because the chest wall curves away beneath the breast. It becomes malposition when the implant sits outside the breast footprint while the patient is upright, widens the gap between the breasts, or sits in the armpit so that the arms brush it. Wide implants chosen to create cleavage that the patient's anatomy does not naturally have are a recurring cause, and chest wall shape plays a real role: a chest that slopes outward, or asymmetry of the ribs of the kind discussed in the piece on facial and breast asymmetry, will steer implants in directions the pocket was not planned for.

Symmastia is less common and more serious, because the skin over the breastbone lifts off the bone and the two pockets become one, sometimes called bread-loafing. A small number of patients have a congenital version, but in cosmetic practice it is overwhelmingly iatrogenic: the pocket was dissected across the midline, or the lower fibers of the pectoralis origin were divided too far toward the sternum in an effort to bring the implants closer together. It is closely linked to requests for dramatic cleavage, to very wide implants on a narrow chest, and to repeated revisions that progressively weaken the medial boundary. It is also, of the common patterns, the hardest to repair, because the skin over the breastbone has lost its attachment and has to be persuaded to readhere.

The high-riding implant and the double bubble: when the fold and the implant disagree

The short answer: a double bubble is a visible step or crease across the lower breast where the implant and the natural fold are out of alignment, either because the implant sits high while breast tissue slides down in front of it, or because the implant sits below an old fold that still shows through the skin.

Two versions are worth separating, because the fixes differ. In the first, the implant is high: it sits under the muscle or inside a tight capsule, and the breast tissue in front of it droops over the lower edge, producing the contour sometimes called waterfall or snoopy deformity. This is common when an implant is placed beneath the muscle in a breast that already had significant sag, and it can develop years later as the breast ages around an implant that stays put. The frequent culprit in a previously good result is contracture, which tightens the pocket and pushes the implant upward; that mechanism is covered in the piece on capsular contracture. The repair usually involves the breast rather than the implant, which is why these patients often end up discussing the combined operation in the piece on breast lift with implants.

In the second version, the implant is in the right place or lower, but the original fold has not released completely and still shows as a band across the lower pole. It is particularly common in constricted or tuberous breasts, where the fold is tight and high by nature and has to be deliberately released and reset, an issue discussed in detail in the piece on tuberous breast deformity. A double bubble of this kind is often a planning or technique problem that shows up in the first months, whereas the high-riding type tends to be a late development.

What revision can honestly fix, and why recurrence is the number to ask about

The short answer: most malposition repairs rebuild the pocket rather than replace the implant, through capsulorrhaphy (suturing the existing capsule to close off the overstretched part), a new pocket in a different plane, internal scaffolds of mesh or processed tissue for support, and often a smaller or lighter implant, and recurrence is common enough that a surgeon who does not discuss it is not discussing the operation.

Capsulorrhaphy is the workhorse. The surgeon opens the capsule, scores or excises part of it, and sutures it in layers to recreate the lost border, raising a bottomed-out fold, closing a lateral pocket, or reattaching the skin over the sternum in symmastia. It works most reliably when the capsule is thick enough to hold sutures and the tissue is not severely thinned. When the capsule is thin, surgeons turn to a site change: moving from a subglandular pocket to a fresh subpectoral one, or creating a new pocket in front of the old capsule (a neosubpectoral or neoprepectoral pocket), so that the implant sits in untouched tissue with borders that have never been stretched. Capsule flaps, where a portion of the old capsule is used as a sling, are another option.

Scaffolds are increasingly used as reinforcement: acellular dermal matrix, biologic meshes, and absorbable synthetic meshes laid along the repaired border. They add real support, and they also add real cost, and the regulatory and durability picture is thinner than the price tag suggests, as the piece on internal bra mesh sets out. Textured implants once served a similar purpose by gripping the capsule and resisting drift, but their association with breast implant associated anaplastic large cell lymphoma, explained in the piece on the BIA-ALCL risk picture, has pushed many surgeons away from choosing texture for positional stability alone. The single most effective change is often the least glamorous one: a smaller, lighter implant, because the load on the repair drops, a point that ties into the piece on whether breast implants need to be replaced.

Some patients are better served by removing the implants altogether, with or without a lift or fat grafting, a route covered in the piece on implant removal and skin retraction and the one on fat transfer as an alternative to implants. Recovery after a pocket repair is usually stricter than after the original augmentation, with a supportive bra or band worn for weeks and delayed upper-body exercise (see the piece on returning to exercise and the one on compression garments), because the sutures are holding tissue that has already failed once. Repeated revisions carry their own costs, discussed in the piece on the revision consult economy, and any implant revision should be accompanied by records of the device, as described in the piece on long-term implant surveillance.

The honest summary

Breast implant malposition is a pocket problem wearing a device's name. Bottoming out is a fold that was lowered too far or gave way under an implant too heavy for the tissue. Lateral drift is an outer pocket that was over-dissected or stretched. Symmastia is a medial border opened across the breastbone, usually in pursuit of cleavage the anatomy did not support, and it is the hardest of the four to fix. The double bubble is a disagreement between the implant and the fold, either because a high implant has breast tissue sliding off its lower edge or because an old fold was never fully released. Many of these outcomes were set in the consultation, through an implant chosen wider or heavier than the breast could carry, which is why the most useful protection is conservative sizing matched to measured tissue. When malposition does occur, the repair usually means rebuilding the pocket through capsulorrhaphy, a fresh plane, or a scaffold, very often with a smaller implant, and it carries a real chance of recurrence that the surgeon should quote rather than dismiss. The implant is rarely the thing that went wrong, and replacing it alone is rarely the thing that makes it right.