With a BBL, is there a chance for rejection of fat?

There is a very low risk for fat necrosis and infection.  Some surgeons have a much lower rate than others.  Find a BBL expert who
performs hundreds of BBLs each year and has great reviews and great
before and after pictures.Kenneth Hughes, MDLos Angeles, CA

Hello, and thank you for reaching out to us.In my patients, they can expect between 60-80% of the fat to survive. The survival rate depends both on the genetics of your body and the skill of the surgeon. Post surgery, you should follow the plan laid out to you by your surgeon, and avoid putting pressure on your backside (sitting) when possible.Good luck, please let us know how it goes.- Dr. Constantino Mendieta

Since you are using your own fat, your body does not reject it.  Fat is very fragile material, however.  If it does not get adequate blood supply to survive or if it gets crushed, it may liquify and go away (or need to be drained) or harden and even calcify which can lead to palpable lumps. 

Hello, thank you for your question. You would never reject the fat, as it is your own fat that's being injected. Rather than that, you should keep in mind that it is live cells that we are transpositioning, and those cells have to survive for a couple of days on the surrounding oxygen and nutrients that the other native cells are not using, until the body creates new blood vessels to nurture this live transpositioned cell. Some cells will not survive, it is a fact, and depending on technic and your body's ability to create new blood vessels, that a higher percentage of cells survives the transposition. Hope to have been of some help. 

I would not say specifically that fat is rejected, but rather some fat may not "take."  Usually the material that does not take gets resorbed, but thre is a risk of fat necrosis or drainage.