Replying to ACL & Bindings

Hey I posted this in the "What binding" sticky, but not responses, so I am trying this route.

Last year I tore my ACL while stopping,  I was going fast and I was about 80% stopped when my knee buckled and  gave out and I am now currently 3 months away from skiing.  I have '02 madtrix with '99 Tyrolia TD8 (din 3-11) which are set at 7 (5'8", 190lbs), and if you know the binding, they have a heel piece that can rotate.  I did tweak it a few years back so that helped it go but I never thought it would go because of stopping. 

So my questions are:
a) Do you think my bindings failed me and should have released if there was that much pressure to tear my ACL?

b) I am going to get some new bindings (about time, plus kinda scared to go back into those oldies), so what are the most ACL friendly ones on the market?  To me a heel piece that can rotate is safest for my knee so that I am not limited to just forward pressure, but am I wrong in that assumption because there are so many that have stationary heel pieces?

Let's save our knees!