Fat grafting requires modified liposuctioning of fat cells followed by processing of the fat cells, and finally re-injection of fat cells into void/deficient contour areas. Both harvestings of fat and injection of fat utilize micro-cannulas which are smaller versions of cannulas used in liposuction. As a result, postoperative pain associated with fat transfer/grafting is similar to liposuction procedures. Patients should expect to be sore for approximately one week. Patients often describe a dull muscle like soreness that you might experience after weightlifting.