Catholic University 1 article published in JoVE Medicine Mechanical and Controlled PRP Injections in Patients Affected by Androgenetic Alopecia Pietro Gentile1,2, Simone Garcovich3, Maria Giovanna Scioli4, Alessandra Bielli4, Augusto Orlandi5, Valerio Cervelli6 1Plastic and Reconstructive Surgery Department, University of Rome Tor Vergata, 2Chief of Teaching of Plastic and Reconstructive Surgery, Catholic University, 3Dermatology Department, Catholic University, 4Anathomic Pathology Department, University of Rome Tor Vergata, 5Chief of Anathomic Pathology Department, University of Rome Tor Vergata, 6Chief of Plastic and Reconstructive Surgery Department, University of Rome Tor Vergata This paper aims to describe the interfollicular autologous platelet-rich plasma injections (0.20 mL x cm2) in the scalp of 23 patients affected by androgenetic alopecia at a depth of 5 mm using a medical injector gun equipped with a 30 gauge needle, in three sessions.