What's the alternative, reduced (or no) mobility, chronic pain, related health problems?

I know probably 10 people who have had one or both knees replaced - all were in their 70s. It has changed their worlds from a painful arthritic joint (as well as other causes) to be able to get around freely and with little to no pain.

Do your research, consult more than one doctor (and in more than one country if possible). Weigh the pros and cons FOR YOU. Then decide.