Worrying that he had dementia given the recent death of Jeff Astle. Hopefully the footballs being so much lighter these days, current players won't be so much affected in later years.
As a kid before being old enough to go to Filbert Street on my own, I used to watch Brush Sports, later named Loughborough United at their Brown's Lane ground.
They had a centre half called Stan Hodges. Often when he headed the ball he would knock himself out.
Once, on a rainy day, when the ball went out of play I went to kick it back and thought I had broken my foot. It was like concrete!