Wife is looking at knee replacements in the very near future - and we bought a (used) recumbent stationary bike for he to build up before and for post-op phys therapy.

Back when I was in college at Ohio State, I had dislocated my right knee for the second time - and at the campus hospital they wanted to to a knee replacement on me at age 18. No freaking way! I said. Yes, I've wrecked/twisted/dislocarted the right knee at least three more times, and the left knee twice since then. The knees are extremely 'crunchy' now almost 40 years later. I'm sure I'll need the replacements eventually... But I'm going to keep riding as long as I can!!! I've even signed up for two Centuries later on this summer...