Granny's hand

When I was little I noticed that my Grannys right hand was different than other peoples. The knuckle on the middle finger was bent and was slightly raised above her other fingers. It didn't keep her from using it and she never said anything about it that I remembered. I just remember it was different.
I was talking with my Mother recently and asked about it. She told me that Granny and Grandaddy had borrowed a car from his work and were driving to visit family. My Aunt Faye was little and in the front seat between them. Back then, there were no seat belts or anything. There was a another car that forced them off of the road and the car started to roll. As it did my Aunt was thrown toward the window on my Grannys side. Granny put her hand out to keep her from being thrown out the window and when the car rolled her hand was pinned between the car and the ground. It was almost cut off across her knuckles.
Miraculously they were able to save her fingers but the one knuckle never worked right.
Whenever I see a picture of my Granny now and see her hand, instead of thinking it was different or somehow odd, I think about how she loved and sacrificed to save her child.