Can gluteal implants placed under the muscle move out of place and what may be the reasons this would happen?

Allow me to answer your question as best i can without any photos. Also, please keep in mind that an in-person consultation with physical exam is first necessary before any legitimate evaluation or final surgical recommendations are made.A gluteal implant placed under the muscle should not move above the muscle unless it was either not correctly placed under, or within, the muscle in the first place or there has since been significant trauma to the area. Glad to be of help. 

I always dissect the pocket for the implant, so that the pocket is just barely large enough to accommodate the implant.  This allows for less freedom of movement.   Surgeons place the implants either underneath the fibrous tissue (fascia) covering the surface of the gluteus muscle or underneath the muscle itself. An exam would be required to determine where your implants were placed. Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles, CA