Hey Beauty!!!
I am just out of chronic tendonitis in ankle area...(Do not know the name of tendons's...Treillin is another story)
...Anyhow Dr. did laser it and then ultrasound...
The explanation was (i thought/think it is logical)
With laser tendon is torn and then it must repair itself...kind of like the way muscle tears and then repairs itself with weights....so the sacr is what makes it "heal" and resistant again...the ultrasound sends vivrations....hum...now I am stuck...No me acuerdo...
I do not remember what the ultrasound does...bot it is something like vibrations/ bloodstream/ waste...
Hope it helps...