Originally Posted by Tourist in MSN

I was riding my bike with a few friends. It was a very very windy day, I was riding down a bike path at high speed with a side/tailwind. And suddenly there is a tree down in front of me that I could not stop for. Hit it at probably about 18 mph. The initial MRI showed the doctor and physical therapist that I had a very bad shoulder dislocation. I said no, did not dislocate because when I got up off the ground, the first thing I did was move all of my major joints to test for bone fractures, and everything moved, although left arm was not very responsive. They showed me on the MRI a huge dent in the shoulder socket where the ball had been pulled out of the socket and then popped back in under enough force to leave a dent. Some of the nerves were damaged too, that was why my arm was not very responsive.

In other words, I ran into something at high speed and went flying over the bike. I suspect that my tight grip on the brakes meant that when I went flying that my left arm got yanked out of the joint to cause the nerve damage and dislocation.