Mary, a brace will tell you something-- if your knee becomes more stable in the knee brace and it is easier to walk, then you will know if a space change will affect your knee. I know that in my own case, the A/P movement was slight--it should have been 1-3 and instead it was 3-5--but, I could feel the shift. This time out with a spacer that is 2mm thicker, my knee is much more stable. I can feel the lack of motion.
I think that Pilot recently went in for a spacer change to get a more stabilized knee and his doc changed out the femoral component as well. He did not think the space fit will within the femoral component and he changed it.
Essentially, that is what your second opinion told you. You need a thicker spacer and he will change only that as long as the knee functions well with just it. If it does not work well, he might have to change the femoral component as well.
The arthrofibrosis is the fly in the ointment here. perhaps you need someone who is a specialist in arthrofibrosis? I think that there is a Dr. Noyes at the Steadman clinic who is working with those patients--I am not sure it is a true speciality. But, perhaps you might get some answers from someone like that.
I know that I thought really long and hard before I took on this surgery--and it has not been easy at all. I have had to basically sit still for almost 6 weeks. If the knee is hot thus inflamed, we do almost nothing at pt. Strictly e-stym and minor table stretches, massage the swelling and ice. Now, at six weeks, my knee is finally settling down. My pt told me today that he thinks we should wait for two more weeks--the possibility of adhesions forming is less after 8 weeks. For me, I am just trying to give my knee the best shot possible. If the adhesions reform, at least I know that I tried what I could to prevent them.
I understand the muddle you are in--trying to find a solution to a very complex problem. I would not give up though--I would continue to search for a doc whom you trust who offers a reasonable plan for success---or an acceptable plan for continuing along without surgery. Kelly