The xrays were not digital and the vet still has them. He said there is some 'losseness' around the 'cruciate'(?) but he doesn't feel it's enough to warrant surgery at this time. She had jumped out of a window a few months ago and he thinks it's possibly from somesort of damage she sustained at that time and the 'fuzzy' could be from the healing, thus the next xray, he said sometimes tumors can do this too but there would usually be some visible damage to the bone, this is why he wants to do another xray in a month. I'm just glad it's nothing hugely abnormal, it just seemed to come so suddenly but maybe that's just how I noticed it. Thanks for your reply!