@lrcraig : I posted about noisy knee shortly after my TKR in 2018. Initially there was a very audible “crack” sound (and a slight popping feeling) with every step I took. It lasted at least a year, but then it gradually subsided. I still have that crack/pop when I do some hamstring exercise - bending and stretching leg while prone, at the point where I bend it to the maximum point, but other than that no more weird noises or sensations.