@jboles That's my fear now.
I had no indication there might be any difference between the recovery or that my knee would be more complicated until the registrar mentioned it as I was going into theatre. When I went for my pre-op the nurse said it was a complex procedure, but when I queried it I was told it was just down to a non-routine prosthesis being used and they allowed more theatre time. Maybe I was naive. I assumed a bone on bone knee was just that and surgery would cure it, although obviously there can be complications and I knew that not everyone was happy with the outcome.
@Jockette I didn't think to ask that question specifically, just assumed any issues would be corrected with surgery. I remember hearing that the tracking should be greatly improved.
@Celle I don't have the pain all the time, but it was there even before and when I wasn't doing that exercise, which I do for my back and hip issues rather than my knee. That area plus the centre of the kneecap have always been where I've had most pain, the joint itself has never been really painful after the first few days and I did wonder about this IT band issue. I seem to remember reading something about it and valgus knees somewhere.
This morning, after reading
@DLR comment about the ball between the knees I remembered my PT hadn't used a ball, it was a pillow. I don't have a large ball around, but thought I'd try my Pilates ring and no pain! Brilliant, thanks for the suggestion. I'll try that for this week, but if the pain persists in between times I'll lay off the exercises for a while until things calm down again.
Thanks for all your advice and suggestions.