Fat transfer survival - what type of things cause fat cell death?

In our experience around 50-60% of fat transferred for buttock/hip augmentation would survive. However, that is not entirely predictable and small difference in graft take from one area to other may be seen. Extensive pressure for prolonged time, fall, localized injuries may further alter fat survival in affected areas. Hope this helps.

After a second BBL, it's important to protect the newly transferred fat—especially in the first 2–3 weeks, which is the most critical period for fat survival.
* Excessive bending, pressure, or bumping into objects can reduce fat survival, especially on the hips and buttocks where grafted fat is still establishing blood supply.
* Sexual activity that puts pressure on the buttocks or hips can also be risky early on.
To protect your results, Avoid direct pressure on grafted areas for at least 3 weeks, Sleep on your stomach or sides, Delay intercourse involving hip or glute pressure for 2–3 weeks, or until your surgeon clears you.
Gentle movement is okay, but anything that causes pressure, friction, or trauma should be minimized during early healing.
Erman AK, MD. Plastic Reconstructive & Aesthetic Surgeon.