Ketamine has been something I have seen used. The lack of reaction from people having broken bones manipulated while under its influence is very disconcerting.

I believe midazolam can cause amnesia, it's not technically an anesthetic in the sense that it doesn't knock you out, but it's a sedative.

https://en.wikipedia.org/wiki/Midazolam

Versed’s ads on radiology magazines literally say “For when they need to forget.”