I crashed my motorbike last week and broke my left collarbone and fractured my left wrist. Yet I can still play the concertina....
That's not a boast, or a tribute to some massive pain threshold with which I am gifted. (I'm not). I was pretty surprised to realise that playing was not the torture session I presumed it would be.
The wrist fracture is slight and it's below my little finger, so moving my little finger is a little bit sore, depending on the combination of notes, but perhaps more surprisingly, the collar bone break is relatively unaffected by the concertina playing action. I'm lucky it's the left side because when I'm playing I keep the left side of the concertina static, and my left arm tight into my body, in a similar position to the recommeded recovery position, and into which the standard sling places the arm anyway.
Actually, apart from the shaker, I don't think there are many other instruments that could be played with a broken collarbone!