Not really the same thing, but kind of relate-able...
I had hair implants a year or two ago (Can't remember..) All I remember was the docs saying specifically: "Careful with your head when getting in cars.." I think I've never head butted so many things in my life hahaha... Indeed the car was one of them getting in, then the back of my head with the corner of the bed when peeking underneath trying to find something.
If you're not supposed to cause a certain body part harm, you can rest assured know it's going to happen! haha