I decided to have the knee replacements after cortisone and lubricant injections stopped working. The ultimate decision point was when I missed out on hiking during a trip to Utah because of pain. My right knee was done Aug 2, 2017. First couple of months were fairly miserable. I kept working on recovering flexibility and endurance and enjoyed a 5 mile walk yesterday. My left knee is scheduled for May 16, 2018. I wish I would have found sites like this before my first surgery so I would have had more realistic expectations on the recovery process - I was VERY naive.