I've had both of my kneecaps removed, one in 1991 and the other in 1993. Back then I was put into an immobilizer for 6 weeks as my patella tendons healed. My scars were almost as long as my TKR scar. The recovery for the first few weeks was about the same as a TKR, but it improved much quicker than the TKR did. If I can be of any help, please ask away!
Please give us some more information about your knee's history. When did you have your replacement then your revision? Which knee was it? Will you be getting another revision when your kneecap is removed and do you have a date for that surgery? I will put these dates into your signature. Knowing these things helps us to advise you better.