Thank you for your comments and my thanks to Mayo for organizing this forum so people can share their experiences & learn from one another. I've always been active, my entire life, used to play competitive racquetball. For two weeks in Feb I avoided the stairmaster but that did nothing to mitigate the pain from a flight of stairs. To gauge the impact of weight I climbed a flight of stairs and then repeated wearing 5lbs of weight around my waist. I found the diff in pain to be remarkable. A better exercise alternative is swimming but I've come to accept that pain will be with me bec I refuse to give up exercise. If I can lose more weight it should get better. Eventually, the technology will improve but I'm just thankful I didn't TKR both knees. My suggestion to anyone reading is to explore the alternatives which include, but are not limited to, loss of weight, Hyaluronic Acid, PRP, stem cell, cortisone and dietary changes. If I had it to do over again, I'd sooner go to a weight loss Boot Camp for a month than endure the grief that followed my TKR.