Has trauma to breast after fat transfer caused loss of transferred fat?

It is very unlikely that you caused harm when this happened to you.  Many of our patients have been punched by their kids in their breasts, some pretty hard, and all the fat survived-just keep an eye out on your progress and communicate any changes to your PS.

Right now you need time to heal, but please let your surgeon check your breasts. You may find that fat still survived. Otherwise, more fat can be transferred later once you have healed.

It is a possibility that the trauma lead to bleeding that could necroses fat cells. Best to see your surgeon ASAP for detailed examination of the area and a possible scan. 

I can't be sure about this but be aware that it is certainly possible to see the reduction of a fat transfer that was placed into the breast for augmentation recently.  Fat grafting routinely loses a fair part of the fat transfer placed   for enlargement after six months anyway( possibly as much as fifty percent) requiring further grafting.  If you have further questions about this change after the injury you may want to direct your questions to the Plastic Surgeon who performed your surgery.Frank Rieger M.D.  Tampa Plastic Surgeon