Doc suspected a torn lateral meniscus. Only hurts when running, but sprinting doesn't seem to bother it -- only slow jogging. Usually starts after a mile. Always stops hurting if I stop running, but doesn't feel as 'stable' as my right knee. Cycling doesn't hurt it, never had knee pain when playing basketball or tennis, but that was 10 years ago. Over the last decade I've tried running off & on but always quit because of the pain. Have also had about a dozen left ankle sprains from high school basketball. I thought it was ITBS, so I did the stretches and exercises for a few months. I could really feel it up my left leg when using the side leg lift machine, that's one of the reasons I thought that it was ITBS.
Dr. doesn't know what else to do, and I'm out of ideas. HELP!