@rodillas If I were you, I'd try to get a another opinion from another doctor that is associated with another hospital. I'm in sort of the same situation. My doctors are telling me that I need a hinged knee replacement. Unfortunately they seem to have a very high failure rate. When I ask why I need this, they say "your knee is unstable" and never tell me exactly why it is unstable. So I got another opinion from another doctor in another hospital and he explained that I have a flexure-extension imbalance, which means when I bend my knee my ligaments get so loose that my knee can easily dislocate. Now the question is how did this happen?? There are probably a few reasons why this happened, one of which is the surgeon probably installed my knee replacement wrong and I be willing to bet that they are worried about a lawsuit, which would explain their silence. This may sound crazy, but I wouldn't sue the doctor because I know he acted in my best interest but sometimes sh*t happens. I just want it fixed. So if I were you I'd get a totally independent second opinion. You will be surprised what you learn.