Sir:FigureAutologous fat grafting has become a well-established and frequently applied method for soft-tissue regeneration and augmentation with both cosmetic and reconstructive indications. Nowadays, capabilities of this surgical procedure to improve the tissue quality are well known.1–5 In the past 20 years, although many different techniques have been developed, a standard procedure has not been chosen. Variables include harvesting technique, centrifugation, and injection technique. In our opinion, injection technique is a possible factor that has biological effects on adipose tissue. In our experience, blunt cannulas are not the perfect instruments needed to reach our target, which is the ability to perform a quick, safe, and painless procedure. Our choice for the reinjection of transplanted fat is an 18-gauge angiographic sharp needle (Cordis Corp., Bridgewater, N.J.) and the Seldinger technique. This choice has matured as a result of our first experiences in the use of autologous fat grafting; indeed, we started to treat burn scars, whose damaged tissues were characterized by a high level of fibrosis that conditioned a significant resistance to the sliding of the devices used for fat injection. From 2005 until now, we have performed more than 1000 procedures to treat not only burn scars, but also surgical scars, hard-to-heal wounds, and radiodystrophic tissues, all cases with a common feature: the presence of overflowing fibrous tissue. During our experience, we noted that the sharp angiographic cannulas, compared with the blunt ones, allow us to achieve better results. We are able to perform a highly precise technique; angiographic cannulas allow us to easily overcome tissue resistance related to the presence of fibrous tissue, thus making it possible to lay a constant amount of fat at the dermal-hypodermal junction. The lysis of scar tissue is obtained by moving the needle through two different methods by which fat is released: the first one consists of pushing the plunger of the syringe and leveraging the strength of exiting fat to overcome the fibrous tissue resistance or, otherwise, we can use a retrograde technique that is performed entering the needle for its entire length at the dermal-epidermal junction and then, while extracting the needle, releasing fat. Moreover, we suppose that a sharp cannula stimulates new collagen deposition and remodeling of fibrous tissues, similar to a “needling” procedure used in aesthetic medicine. Using sharp cannulas, we do not need to perform skin incisions with a scalpel for cannula access, and this minimizes patient discomfort related to the surgical procedure and avoids causing new scars. Another worthy consideration is that 18-gauge angiographic sharp needles for the Seldinger technique are disposable, low-cost devices, adding an additional favorable point in comparison with classic blunt cannulas. The main risks are related to the risk of intravascular fat injection, which can be easily avoided by choosing the retrograde injection method (as described above). Furthermore, in our clinical experience using angiographic needles, we found that edema and bleeding of treated areas have been comparable to those of the standard technique, which are virtually nil. We think that sharp cannulas are the best option for autologous fat grafting, considering the versatility and the excellent results obtained. Fabio Caviggioli, M.D. Università degli Studi di Milano, MultiMedica Holding S.p.A., U.O.C. Chirurgia Plastica, Sesto San Giovanni, Milan, Italy Davide Forcellini, M.D. Università degli Studi di Milano, IRCCS Istituto Clinico Humanitas, U.O. Chirurgia Plastica 2, Rozzano, Milan, Italy Valeriano Vinci, M.D. Università degli Studi di Milano, MultiMedica Holding S.p.A., U.O.C. Chirurgia Plastica, Sesto San Giovanni, Milan, Italy Guido Cornegliani, M.D. Università degli Studi di Milano, IRCCS Istituto Clinico Humanitas, U.O. Chirurgia Plastica 2, Rozzano, Milan, Italy Francesco Klinger, M.D. Università degli Studi di Milano, MultiMedica Holding S.p.A., U.O.C. Chirurgia Plastica, Sesto San Giovanni, Milan, Italy Marco Klinger, M.D. Università degli Studi di Milano, IRCCS Istituto Clinico Humanitas, U.O. Chirurgia Plastica 2, Rozzano, Milan, Italy DISCLOSURE The authors have no financial interest to declare in relation to the content of this article. No outside funding was received.