Originally Posted by
jeff juel
...I would love to know if any of the helmet manufacturers have considered this scenario and if they have determined how frequently this type of injury happens to crashing bike riders wearing helmets.
The manufacturers have known about this mechanism since it's been understood for a long time. Designs have been developed that could possibly reduce this type of injury but have been rejected by manufactures because they would be too complex and expensive to make. As a result, a couple of small companies have tried to sell these, better designed helmets but with limited results.
Current manufacturers are doing well with the simple design they already have. They've managed to convince the public that these helmets are "safe" and that they "save lives" so there is no need to improve on design as long as the public is already sold on it.