You have been given some very good and wise advice here on your thread, from pain meds to exercise etc. I am Day 9 after LTKR, having had RTKR end of November 2013. I can only tell you that I did a whole lot of things wrong with first knee ie not sufficient pain meds or long enough, over doing it with exercise, and my knee was hugely swollen, ROM was poor, but I thought I'd exercise my way through it...dumb! How can you even attempt lunges? Don't you have stitches or staples in your knee? This new left knee is being treated to rest, ice, elevation and Tramadol; I can only tell you from experience that it is going much better! Sleepless nights go with the recovery. I don't think I slept 3 hours last night, but the night before was very good. Get yourself some good books or movies, and follow the excellent advice on this forum to give yourself a good three week startup. I'll follow your thread and wish you luck.