Are butt implants visible while being bent over? Does it matter where there placed?

Just like breast implants, buttock implants can be placed in several different tissue planes.  To avoid visibility of the implant and give the best overall results, these implants should be placed within the gluteus maximus muscle.  The muscle is actually split in half and the implant is place between the two thick layers, like a sandwich.  If done properly, the implant should not be visible.  Other options are completely under the muscle, which can be increase risk of nerve damage.  If they are placed on top of the muscle, either subcutaneous or subfascial, there is a much higher risk of visibility.  So, if buttock implants are placed within the muscle there is very low chance of visibility, even while bending over.  I hope this helps.
Dr. Smart

Regardless of the patients anatomy, buttock implants are best placed within the gluteus maximus muscle (ie intramuscular).  Indeed a “subfascial” placed buttock implant (aka a fancy term for it placed on top of the muscle) may look good for the first 6 even 12 months tops but highly unlikely thereafter. As swelling resolves and the size/weight of the implant succumbs to gravity over time, it will become visibly and papably obvious. The reason for this is twofold: 1) the investing fascia of the gluteus maximus muscle is extremely adherent and interwoven with the deeper muscle fibers. Because of this, it is impossible to place a buttock implant under this fascia layer without shredding it to pieces, thus rendering it subcutaneous (under and suported by the skin only), and 2) buttock implants are >3+ times as large as other implants which are typically placed subfascial (eg. calf and hip implants).  These smaller lighter implants are readily supported long term by the fascia layer, which also happens to be more robust in these other areas. However the much larger buttock implants would eventually thin out and erode through this layer making them obviously visible, artificially palpable, and/or droopy like a "dirty diaper".Implant shape also is extremely important in creating a naturally buttock contour, especially when bending over. Because the gluteus muscle are anatomically much more oval than round, traditional round implants often produce an unatural profile and bulge when bending.  However I have patented a new "Stanton Anatomic" shaped implant that avoids this issue. The benefit of this is the fact that ~80% of patients have more of an oval shaped buttock cheek not round, thus a true oval implant (i.e. Stanton Anatomic implant) creates a much more natural and harmonious buttock contour.  This is especially true when the patients bends over, does squats, or pokes their butt out while striking a pose or dancing. Glad to be of help. 

You should not see the outline of your buttock implants regardless of placement. A fat transfer around the implant can camouflage the implant if it is visible in rare cases.