Blue... good luck with the TKR. Just work really HARD with the PT and you'll be on your bike again in no time. I went to the gym and started trying to make a complete revolution with the new knee on the pedal of a Schwin Aerodyne at six weeks. It took less than a week to make the full circle and I started to ride - albeit slowly - on my 'little old lady' bike. Didn't take very long to graduate back to a real road bike. Keep us posted on your progress after the surgery!