I had a concussion at age 15 , horse bolted and ran through a fence then bucked me off and I landed on my head, blacked out for awhile but made it back home.
Partially blacking out while horse was jogging and bouncing all the way home.. I had no cognitive or physical limitations after recovery from the fall.

Perhaps age at injury, or time frame of injuries, has something to do with it?
After reading all of the forums here it seems that everyone has such varying levels of symptoms in nearly every condition, it is hard to lock anything to 100% or not.


Now that I know about upper cervical misalignment, this did happen in my case and probably played a part in my acquiring RSI /TOS 20+ years later along with the repetitive work I was doing at the time.