Liposonix is a great new technology involve HIFU (high intensity focused ultrasound) that can "obliterate" a zone of fatty tissue without any pain or damage to the skin. The machine is designed to work 1.3 cms below the skin which is little over half an inch. This is ideally suited for the torso, specifically the abdomen and flanks or love handle region is where it is best suited for. The ankles have typically very little "fat" and the bone is very close to the surface. I would not recommend this for the ankles. I hope this helps!