Yah, this year I've had my left knee and my heart done, and I think the knee was the less stressful of the two - but only slightly
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Had 3-4 separate procedures done, all were great. Lifesavers. Do all the rehab, don't fudge on a bit of it. Know that your quads will be shot, and your hammy might be as well depending upon the procedure. It took about two months after the operation to get back to a decent place, and about 4 months to get to close to full strength.
My only regret is that I didn't have it done sooner.