First, 0.3 mm control fenestra is made in posterior 1/3 of the footplate.If floater is encountered, footplate can be lifted using 0.2mm pick
Posterior crura scored using 45 degree pick . IS joint dislocated.
Tendon cut. Suprastructure removed. Further, fenestra is widened with 0.4 and 0.6 mm 4.2mm X0.4 mm piston placed
