Mmm. Miss Professor Carrow taught us that spell and said it was a good way to make sure an enemy you'd defeated couldn't grab a wand and use it, since you can't do wand movements with your wand arm out of joint. But she added that as an added advantage it can 'soften them up' and you might want to have a quill handy to take notes if they want to start telling you everything they know to try to convince you to put their joint back in place.

Carrow didn't actually use the word 'torture.' But she made it clear what she was talking about.