I had BTKR on 25 Aug and was doing really well, or so I thought. Returned to work full-time at 10 weeks (office work, so sitting down most of the day). At about 14 weeks I was suddenly so fatigued on Sat that I slept on & off most of the day. :th_sleep: I would usually go to the gym for Pilates, some recumbent cycling, & aqua aerobics. Ok, I thought, maybe everything had finally caught up with me. But this fatigue continued for 5 weeks, every weekend I 'lost' my Sat as I could only sleep on & off. I'd make it from the bed to the couch, then fall asleep again. Then one week I even missed work on Fri as the fatigue came a day earlier than usual. I've had routine blood tests & all is 'normal' (no anemia, thyroid function ok). As far as the knees are concerned, they are just great! The left one is like new, but there's still some residual soreness in the right. It's so wonderful to walk without that awful arthritic grinding pain. I am having other symptoms affecting the right leg but these are due to a large herniated disc at L5-S1 (below my L2-L5 fusion). The right foot is numb, constant pins & needles, and the right calf is quite sore - but the knee is fine. It's now 17 weeks and I'm wondering when or if this fatigue will ever end. I am so tired of being tired all the time. I guess I want to know if anyone else has experienced this level of fatigue, or if it's considered 'normal' at this stage.