Hi again, Marilynne,
Knee replacement is one of the most trying operations to recover from, because it takes so long and makes such huge demands on your patience. Someone here once joked that if you could get patience from an ATM, the queue would go right around the block.
It's rather too optimistic to expect to be almost back to normal by about 6 weeks, because complete recovery takes a full year. You'll be feeling almost normal long before that year is up, although even then your knee may give you an occasional reminder that it's still a child.
Your head is saying "I ought to be able to do this . . . " but your knee is saying "Not yet. I'm not ready for that yet."
This article may help you to understand your frustration at this point.
Where are you in recovery?? (TKR)
Your pain will decrease gradually, but it doesn't just stop. Many people wean down to weaker pain medications at around 6 weeks, but it's also normal if you need stronger medication up to about 3 months. I was off the heavy-duty narcotics by 6 weeks, but I was still needing the Tramadol and Tylenol combination for at least another month before I weaned down to just Tylenol.
I think it was about 3 months before I felt that I was getting back to almost-normal, but even then my leg would swell if I did too much for it. I know that I used to elevate and ice my knee in the evenings for several months after I became more active.
It may be true that the man you saw did ski at only 6 weeks post-op. Occasionally, we read of someone who has an extra-fast recovery, but a much slower recovery is the norm. It's more likely that his memory has compressed his recovery time span.
I know that
@skigirl went back to skiing after her knee replacements and she was even working as a ski instructor until quite recently, but I'm sure she didn't start until further out than 6 weeks.