In reply to GeoffRadcliffe:
If you use the loops in the 'correct' way (ie, put your hand up through the bottom of the loop, before holding the handle together with the top of the loop, rather than putting your hand through from the top straight onto the handle) there is apparently less chance of breaking anything - I have nothing to prove this however it certainly feels this way, with the pole falling away from you more if you slip/let go. Not failsafe though.
It's generally accepted in ski touring that whenever in avalanche terrain loops should never be used, so that poles can be easily discarded if you are caught in an avalanche.
I use the loops all the time (hiking, not skiing) and have never come close to breaking any of me - I have snapped a pole though with my wrist still in the loop (a Leki one too, not anything cheap and flimsy), together with giving myself a very impressive bruise on my thigh!
Hope you recover quickly