Bone on bone on my left knee . Hit by a car at 18 years old and had a compound fracture on my right leg required rods/pins in my leg at the time. Over the years put more bearing on my left leg, I am now 55 years old, put on alot of weight and all of this is killing my knees. Have received Cortizone injections into my left knee from Kaiser for years but need something long term.