I have publisheh this flap in 2000 ( Canal wall reconstruction and mastoid obliteration with composite multi-fractured osteoperiosteal flap
European Archives of Oto-Rhino-Laryngology and Head & Neck 263 (12), 1082-1086, 2006 ). You can find this article as a open acces and a short video about ucar flap in youtube. Sincerely yours