We run into a lot of pedestrian injuries and I think that we all assume that when a car hits a pedestrian that the person will sustain some type of fracture, whether it's the arms, legs, or hips. But these collisions almost always result in the body being thrown against the car or to the ground. So, many times what happens is the head is involved. Either it strikes the vehicle, strikes the ground or even without contact, the back and forth whiplash action of the head can cause internal damage to the brain, resulting in a brain injury.
I think the thing to be mindful of when someone has had a pedestrian accident is that the orthopedic injuries are usually most acute but many times the brain injury may not manifest itself immediately. Sometimes it does but sometimes it manifests over the following days and even weeks. It's something definitely to keep in mind because brain injuries are very common after a pedestrian crash.