In Knee: Worst injuries acquired through skating?

Worst injuries acquired through skating? i broke my tail bone a two years ago... the doctor said it may never heal, if I sit too long it is really hard to get up, i have to use my arms and the time i hit my head and was knocked out and convulsing 10 cracked ribs split shin requiring 14 stitches bruised prostate and swollen purple junk from racking on a rail dislocated both shoulders 5-6 ...Knee