What do hospitalization rates have to do with injury rates, with respect to head injuries?<p>Totally anecdotal story, but when I had my last major bike crash (20mph crash during a race), I went to the ER to get checked out. I probably didn&#x27;t need to go; I knew I had a concussion and lots of abrasions (and know how to treat both). This proves nothing about the efficacy of wearing a helmet.