I damaged my knee 15 years ago. In physio they would apply tens to warm up the knee prior to exercise then ice to bring down the swelling. Hated the ice, the tens on low was fine but cranking it up my knee would spasm. If it works, great. Still discuss with your Dr. other options. I had surgery (ACL) that really tightened up an other wise sloppy knee and have no problems since aside from a slight limp when the temp drops below freezing.