Figure 1.

Y-split recession, side view.

Notes: (A) The first orientation point (a) is determined by the natural midpoint of the muscle insertion. The second orientation point (b) is located 6 mm directly behind a. With a compass, the distance r_a is marked with colored dye on the globe. The same procedure is repeated from b, with the distance r_b marked with colored dye as well. The intersections of the two marked lines indicate the new insertion points for the split muscle halves. (B) The control distance (c) ensures the correct placement of the new insertion points.