I've not had the pleasure, but among people I know who have had it done, most say it's the greatest thing going. One guy, who was 49 when he had it done, still has a residual limp and seems to be in some pain, but he's the only negituve I've heard. I have been told that knee replacement is more painful, which seems counterintiutive to me.

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2002 Ford ZX2
2 x 2013 Honda Civics