Expensive, high-tech helmets with air-lining systems aren't much better than vintage "leatherheads" for preventing concussions, a new study finds. "The occurrence of concussion has been constant for the past 30 years: whether it was a leather helmet, a plastic helmet with web suspension or foam, or one with the new combination air cells and padding," said study author Joseph Torg, professor of orthopedic surgery at Temple.