Most Heely\u0099 injuries happen when the heeler puts his or her toe down. The sudden stop of the foot sends the heeling youngster headlong into the pavement. It&#39;s the same injury that most often happens to inline skaters. Of course, we break our fall with our hands, which leads to broken wrists and elbows.Twisting, extending, or compressing the cervical spine (portion of the spinal column going through the neck) can lead to paralysis or even death. It may be hard to significantly injure your cervical spine at the speeds commonly achieved while heeling, but not impossible. The risks go up significantly if you let your little girl zoom around the house, where plenty of objects are just ready to catch a head on its way to the floor.Sometimes, heelers don&#39;t get their hands out quick enough to break them. In that case, it&#39;s the nose that connects with the sidewalk.Just like skates, Heelys\u0099 can and do twist ankles. Sprains and breaks are both possible.Falling onto concrete while rolling around at even a moderate speed can lead junior to smack his head. If he isn&#39;t wearing a helmet, it doesn&#39;t take too much force on the noggin to cause swelling or bleeding on the brain. It&#39;s scary to see -- and deadly.