Are you sure they used a TENS at PT and not another type of stim?
[ DIFFERENT TYPES OF ELECTRICAL MUSCLE STIMULATION
EMS, TENS, INTERFERENTIAL and RUSSIAN MUSCLE STIMULATORS]
http://vitalityweb.com/backstore/Muscle-Stimulator.htm
http://vitalityweb.com/backstore/Muscle-Stimulator.htm
http://site.lgmedsupply.com/Pdf/Elec...ementChart.pdf