I have had multiple reconstructive surgeries exact) and 6 "minor" surgeries on my right knee to clean up scar tissue or I replace pins. Some exercises like this still hurt my knee but are less harsh then traditional leg day workouts!
*No Excuse: Knee Injury - A knee injury shouldn't keep you from getting fit. This work-out from Dr. Oz's personal trainer, Donovan Green, will help you build strength without aggravating your injury. It's time to stop making excuses and get moving!