I’m most likely to get at least 1knee replaced if not 2?.The effects of being a floorlayer all my life ?.I had arthritis in the knees and had double knee replacement surgery. I was great for a year and then it was painful to walk again. I was diagnosed with sacroiliac joint disorder. Apparently knee surgery can make your legs uneven lengths. As Roseanne Rosanna Dana said, "It's alwaays something."