If you get your meniscotomy (?), ask your doc to scrape out any arthiritis crystals he might find. DO YOUR EXERCISES during recovery. Get the whole knee replaced, not a partial (others may object, but more problems with partials). Give up tennis - the side to side spurts puts too much stress on knee. Doc said go ahead and play, you'll be back in to see me sooner that way. Walking is best exercise (never liked running), and yes, the less weight, the longer you'll have the knee. Had mine at 63, and was youngest in recovery. Doc said I'd need another knee (in my 80), but we'll see. Good luck, get a GOOD ortho, and a GREAT physical therapist. Check that. Get the best for both. Good luck. PM if want advice, reads like we've got a healthy contingent of those who've been under the knife.