Jeannie, It's actually Elmslie Trillat. I can't give you all the info you need on it but if you need more info you can type it into your search area and read...
Simplification of the Elmslie-Trillat procedure for patellofemoral malalignment Is medial capsulorraphy necessary? T. Tomatsu (1)(2), N. Imai (1), T. Hanada...