I was obsessed with running long distance for many years. I ran 24 full marathons (26.2 miles running the entire distance) until my right knee said NO MORE! So from November 2010 till December 2013 I've had 4 knee surgeries on just my right knee alone. Scope, TKR, scope to remove scar tissue, then total knee revision. It took a very long time and I cried many tears but have finally come to terms that I can no longer run!
After my 2010 scope I kept trying to run but the pain was excruisiting! I had my first TKR in March 2011 and eventually ran several days a week up to 5 miles at a time. When that first TKR was 9 months old I ran a 1/2 marathon with virtually no training. Eventually the TKR was over grown with scar tissue and I could hardly walk to my mailbox, no ROM to speak of either. So 11 1/2 months ago in December of 2013 my total knee replacement was removed and redone with a brand new knee, a different kind and brand. I have an implant stem that goes 1/2 way down my tibia so I will never attempt to run again as I can risk fracture of my tibia.
Actual running on a full revision knee is not a good idea, but I did have several doctors tell me in the beginning after the first 2011 TKR that "a little" running was ok. I was told by an OS, don't run every day just for the sake of running. Don't run junk miles! In other words he told me...if there is a race I want to train for then cross train, bike, swim, elliptical, weight train, etc., then race day go run my event! I did this several times and it worked. It just was not meant to be for me though...two more surgeries on the same knee and I can say I am done with running! Running did not hurt my knees in the first place, but running is something I cannot continue to do.
So I bike now and I weight train. I love the weight training, and I'm trying to like biking, but I am addicted to exercise so I will do what my body/knee will allow me to do.