iontophoresis is basically a way of getting a concentrated steroid cream
to the exact spot where you are having trouble.   Usually a special type
of steroidal cream is applied and then a machine that has little pads
which are placed over the area that the cream has been applied.   The
machine is then set so you will feel like an electric shock kind of
tingling through.  It can be set to be very mild or stronger depending
on what you can tolerate.   This helps get the steroid cream deeper into
the tissues than an ultrasound machine does and often times helps
consideralby with the pain.    Sure hope it works well for your sister!

Donna G