Linda - I'm not supposed to be running either according to my PT, but my orthopedic doc said yesterday that as long as it's HELPING (which it is), then I can run. I do have knee problems and pain, but running and plyo actually helps them feel better, as long as I don't over do it. Now yoga, different story. My knees cannot handle planks and downward dogs and crazy yogi things! Maybe someday, but not yet.
What happened to your knee?