A few years ago, maybe four, I was running around when my very large dog ran into my leg. I felt a big pop and I thought I had broken my leg (I was only about 9 or 10). My father didn't take me to the hospital and I have never seen a doctor concerning it. My dad has Osgoods and my mother has chondromalacia. Since the first incident, my knee has 'twisted', or what have you, at least 7 times.