I was in a car accident in 03 which resulted in a left above the knee amputee and several complications to my right knee and ankle. Since then I have had several operations on both my knee and ankle. I don't understand why I have still had such constant pain in my knee after a total knee operation that was suppose to help my pain? It did make my knee more stable feeling when walking but that's it. What could this gap shown in the X-ray be? The nurse that did it was even con fussed cause she said she had never seen a knee replacement with such a large gap. It was about 3/4 of an inch wide??? Any answer would greatly be appreciated because I'm really worried a out it and I don't go back to my dr until March???