Sorry to hear about your kicker. My wife broke her fib in the Butte last season (deep snow and over the handle-bars), in non-releasables. And, a good friend broke his tib and fib (spiral fractor) in a pair of releasables. The type of binding might not make that much of a difference though. I think it has more to do with the nature of the fall and the type of harder plastic boots (not that leathers provide any more protection).
Like shoulder injuries to kayakers, knee tweaks to the skier, wrist fractures to boarders , lower leg snaps are to the tele rider. It seems to be the most common of the season ending injuries for tele.
Releasable tele binding are not set to release if you fall forward. They are made to release in they are twisted too far and add up to enough pressure. The fall might just be the nature of the beast.
I love to dance, but who needs the music- It throws me off.