I am at my wits end trying to find answers to my problem

. I had a TKR Dec. 2004, and a revision Aug.2005 to replace the knee cap. The joint is wonderful, the knee cap is great, I just have no control. It buckles all the time, somedays with every step. I have rehabed for over a year now thinking it is just weak, but nothing has worked. My surgeon has no idea why, my rheumy says it's the AS, I don't understand what that would have anything to do with it. I'm tired, I don't want to walk anymore

. I need the other knee done but I'm affraid the same thing will happen to that one. Has anyone had this problem? Does anyone have any ideas what may be causing this. I need to get on with this miserable life but can't until someone can come up with an answer and solution. I have been on line for months trying to find research on AS and TKR but there isn't any. I'm tired of surgeries I've had 7 knee surgeries (3 in the last year) and back surgery. I don't want anymore

I'm mad, confused, and beaten down. I don't like feeling like this. Through 30 plus years of AS I have always been the strong, "I can get through anything" person. always lifting up others in tough times. I just don't have the strength to fight anymore.