Can successful fat grafting be damaged years later, causing the fat to die? 7 Years post BBL.

Can fat transfer initially take to an area, but then fail years later? I am wondering if a successful fat transfer to the butt can be damaged, causing the fat to die years later. For example, if someone had a successful fat transfer to the butt, then years later they fell on the area, or had trauma to a surrounding area, could the fat disappear and die? It's been 7 years since my BBL and it took successfully, will thigh lipo under the butt likely agitate the transferred fat, causing it to die?