So it is your belief your memory loss was due to the concussion, not the anaesthesia?
I didn't have surgery--at least not after my concussion. I said I was close to it. I was apparently talking long before my memory returned. My daughter says I kept asking about school (I was at the end of my last semester and had three weeks of class left). I complained when they were stapling my scalp closed.
I've had multiple surgeries, dating from 1980 to 2013. None have caused memory loss. I've also had other concussions without memory loss. This particular injury was worse and whatever happened inside my skull when it hit the ice caused pretty bad memory loss--about four days prior and about six hours after. It isn't coming back.