Anyone ever had a knee replacement?

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On August 10th I'll get my 3rd shot of a gel like substance that's supposed to

lubricate the knee.So far I've been able to walk with just a little pain but my

knee still gets stiff.

I think that it's inevitable I'll need my knee replaced.I worry about the

recovery.The doctor said that I'll be hospitalized for 3 days and then sent

home.Then I'm supposed to get a physical therapist to come to my home a few

times a week showing me exercises I'm supposed to do.

But I don't know how long the recovery period will be,so if anyone has had their

knee replaced please let me know.Btw,I'm 68 year old male who before having an

Arthroscopy on March 9th used to walk 1-5 miles 4 times a week.Now I'm lucky if

I can walk 4 blocks without getting pain and stiffness.