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Partial Sub-Muscular Placement (a.k.a. partial unders & partial sub-pectoral)
* When discussing under the muscle placement with your surgeon, make sure he or she clarifies either PARTIAL or COMPLETE sub-muscular placement.
With partial sub-muscular placement, the upper 2/3 of the implant are behind the pectoral (chest) muscle. The lower 1/3 of the implant is not covered by the muscle. It is located behind the breast tissue.
Pros
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Decreased risk of visible and palpable ripples and implant edges, except for the lower 1/3 portion of the implant, which is not covered by the muscle/fascia.
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Decreased risk of capsular contracture.
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Most of the time, a more natural shape to the upper portion of the breast. In general, there is a more natural slope to the breast, instead of the "upper roundness" that is common with over the muscle implants. This is a good thing, if this is the look you desire.
Cons
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More post-op discomfort, and longer recovery period. This is due to the procedure being more invasive, as well as the muscles stretching out to accommodate the implant.
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The implants take longer to "settle" or "drop".
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The breast implant may appear to be distorted while flexing the chest muscles. This is really not a big deal, unless you are flexing pretty hard.
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The implants are supported by the same tissues (skin) as over the muscle implants, which means less lower pole support (compared to implants placed completely behind the muscle/fascia), which can possibly lead to bottomingout, although bottoming out is possible with any placement.
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Ripples (wrinkling of the breast implant shell) may been seen and/or felt along the lower and outer 1/3 of the implant (the part which is only covered by the breast tissue). However, ripples are possible with the implants placed completely under the muscle, as well.