Day 16- went into PT center to do my own self guided ROM exercises and other stuff. They are great about giving patients access to facility on un scheduled days. And Im also doing a 2nd session at home each day.
I feel better doing these daily rather than laying around so much, and the knee is responding! For me, laying around too much and just icing promoted too much stiffness and shortening in my quads. Most on here advocate doing very little to no PT. I am now discovering that is counterproductive for me. If you are younger, in reasonable shape with a lower BMI going into surgery the mantra of "don't stand when you can sit, and don't sit when you can lie down" maybe be not be optimal. At least its not for me personally at this short juncture.
Not all OS's are uninformed on post surgery rehab (mine is very good and pragmatic) and there are some very good PT's out there too. I think everyone has to quickly find their "activity sweet spot", and in my case after just three days of a more proactive rehab program- I can tell a huge difference in my progress. So I guess I've had my first breakthrough moment. For me icing a lot, rest and elevate are still very big- but after twice daily sensible PT and walking. Ive picked up 15 degrees of ROM flexion in last 3 days- and have LESS pain.
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I think regardless of age or weight, we all have to find what works best for us and the only way to do that is through trial and error. I'm 44, in decent shape, healthy (other than OA) and lead an active lifestyle. PT 3x a week was not doing it for me so I have recently found that a balance between PT and my own daily activities and exercises work best for me. There is not a "one size fits all" regimen when dealing with TKR. The great thing about this forum are stories like ours that will give others ideas on what to try until they find what works for them. Kudos on your improvement! It sure feels good and makes you look forward to what's ahead! 
