Torn ligament

I'm starting to learn the basics of looking and analyzing x-rays. For example the picture I have attached is of a torn ligament. This is a dog knee and you can see the squiggly line (that I tryed to point to). This line is supposed to be straight, definitely not the way it looks. The other picture is Dory, she's adorable. She was sitting really normal, but when I went to take a picture of her she rolled over like this.