How potentially painful is it for someone with metal in the leg to use cavitation on the body? (photos)

I am considering ultrasound cavitation combined with laser for fat removal of the midsection however, I am told I will experience discomfort (which to me means it will hurt!) with regard to the ultrasound frequency heating up the extensive hardware (24 screws and a long metal plate) in my ankle and going up to outside of the side of my lower leg from the ankle up after having had surgery on a shattered ankle/tibia.

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