Have you ever broken a bone?
When I was 16 years old I broke my middle finger because I fell down from about 2,5 meters and landed on my hand with my body on top. Broke my finger. Yeah, I also got my litle finger fucked up during a soccer match. I was the goalie and the ball hit my litle finger so hard it compressed a joint. So I have a stiff litle finger. My middle finger is 100%.